diff --git a/src/basics/Color.h b/src/basics/Color.h
index 9af2225..f305d60 100644
--- a/src/basics/Color.h
+++ b/src/basics/Color.h
@@ -35,7 +35,12 @@ class BASICSSHARED_EXPORT Color {
     Color add(const Color &other) const;
     Color lerp(const Color &other, double f) const;
 
+    inline bool operator==(const Color &other) const {
+        return r == other.r and g == other.g and b == other.b and a == other.a;
+    }
+
   public:
+    // TODO Make private
     double r;
     double g;
     double b;
@@ -52,11 +57,4 @@ BASICSSHARED_EXPORT extern const Color COLOR_GREY;
 }
 }
 
-// Inlining
-#if PAYSAGES_USE_INLINING
-#ifndef COLOR_INLINE_CPP
-#include "Color.inline.cpp"
-#endif
-#endif
-
 #endif // COLOR_H
diff --git a/src/definition/ColorDiff.cpp b/src/definition/ColorDiff.cpp
new file mode 100644
index 0000000..0f7ed8f
--- /dev/null
+++ b/src/definition/ColorDiff.cpp
@@ -0,0 +1,13 @@
+#include "ColorDiff.h"
+
+ColorDiff::ColorDiff(const DefinitionNode *node, const Color &oldvalue, const Color &newvalue)
+    : DefinitionDiff(node), oldvalue(oldvalue), newvalue(newvalue) {
+}
+
+ColorDiff::ColorDiff(const ColorDiff *other, const Color &oldvalue, const Color &newvalue)
+    : DefinitionDiff(other), oldvalue(oldvalue), newvalue(newvalue) {
+}
+
+DefinitionDiff *ColorDiff::newReversed() const {
+    return new ColorDiff(this, newvalue, oldvalue);
+}
diff --git a/src/definition/ColorDiff.h b/src/definition/ColorDiff.h
new file mode 100644
index 0000000..65ff39b
--- /dev/null
+++ b/src/definition/ColorDiff.h
@@ -0,0 +1,36 @@
+#ifndef COLORDIFF_H
+#define COLORDIFF_H
+
+#include "definition_global.h"
+
+#include "DefinitionDiff.h"
+#include "Color.h"
+
+namespace paysages {
+namespace definition {
+
+/**
+ * Diff for a ColorNode.
+ */
+class DEFINITIONSHARED_EXPORT ColorDiff : public DefinitionDiff {
+  public:
+    ColorDiff(const DefinitionNode *node, const Color &oldvalue, const Color &newvalue);
+    ColorDiff(const ColorDiff *other, const Color &oldvalue, const Color &newvalue);
+
+    inline const Color &getOldValue() const {
+        return oldvalue;
+    }
+    inline const Color &getNewValue() const {
+        return newvalue;
+    }
+
+    virtual DefinitionDiff *newReversed() const override;
+
+  private:
+    Color oldvalue;
+    Color newvalue;
+};
+}
+}
+
+#endif // COLORDIFF_H
diff --git a/src/definition/ColorNode.cpp b/src/definition/ColorNode.cpp
new file mode 100644
index 0000000..68f9014
--- /dev/null
+++ b/src/definition/ColorNode.cpp
@@ -0,0 +1,74 @@
+#include "ColorNode.h"
+
+#include <cassert>
+#include <sstream>
+#include "ColorDiff.h"
+#include "Logs.h"
+
+// TODO Could be made into a template
+
+ColorNode::ColorNode(DefinitionNode *parent, const string &name, const Color &value)
+    : DefinitionNode(parent, name, "color"), value(value) {
+}
+
+string ColorNode::toString(int indent) const {
+    ostringstream stream;
+
+    stream << DefinitionNode::toString(indent) << " " << value.r << "," << value.g << "," << value.b << "," << value.a;
+
+    return stream.str();
+}
+
+void ColorNode::save(PackStream *stream) const {
+    value.save(stream);
+}
+
+void ColorNode::load(PackStream *stream) {
+    value.load(stream);
+}
+
+void ColorNode::copy(DefinitionNode *destination) const {
+    if (auto tdest = dynamic_cast<ColorNode *>(destination)) {
+        tdest->value = value;
+    } else {
+        Logs::error("Definition") << "Can't copy from " << getTypeName() << " to " << destination->getTypeName()
+                                  << endl;
+    }
+}
+
+void ColorNode::setValue(const Color &value) {
+    addDiff(produceDiff(value));
+}
+
+const ColorDiff *ColorNode::produceDiff(const Color &value) const {
+    return new ColorDiff(this, this->value, value);
+}
+
+void ColorNode::generateInitDiffs(vector<const DefinitionDiff *> *diffs) const {
+    diffs->push_back(produceDiff(value));
+}
+
+bool ColorNode::applyDiff(const DefinitionDiff *diff, bool backward) {
+    if (!DefinitionNode::applyDiff(diff, backward)) {
+        return false;
+    }
+
+    assert(diff->getTypeName() == "color");
+    auto color_diff = dynamic_cast<const ColorDiff *>(diff);
+
+    if (color_diff) {
+        Color previous = backward ? color_diff->getNewValue() : color_diff->getOldValue();
+        Color next = backward ? color_diff->getOldValue() : color_diff->getNewValue();
+
+        if (value == previous) {
+            value = next;
+            return true;
+        } else {
+            Logs::error("Definition") << "Can't apply color diff" << endl;
+            return false;
+        }
+    } else {
+        Logs::error("Could not cast DefinitionDiff to ColorDiff");
+        return false;
+    }
+}
diff --git a/src/definition/ColorNode.h b/src/definition/ColorNode.h
new file mode 100644
index 0000000..544d4a2
--- /dev/null
+++ b/src/definition/ColorNode.h
@@ -0,0 +1,44 @@
+#ifndef COLORNODE_H
+#define COLORNODE_H
+
+#include "definition_global.h"
+
+#include "DefinitionNode.h"
+#include "Color.h"
+
+namespace paysages {
+namespace definition {
+
+/**
+ * Node with a single color value, for the definition tree.
+ */
+class DEFINITIONSHARED_EXPORT ColorNode : public DefinitionNode {
+  public:
+    ColorNode(DefinitionNode *parent, const string &name, const Color &value = COLOR_TRANSPARENT);
+
+    inline const Color &getValue() const {
+        return value;
+    }
+
+    virtual string toString(int indent) const override;
+    virtual void save(PackStream *stream) const override;
+    virtual void load(PackStream *stream) override;
+    virtual void copy(DefinitionNode *destination) const override;
+
+    /**
+     * Change the color value stored.
+     *
+     * The DiffManager is used as intermediary, so that the change may not happen immediately.
+     */
+    void setValue(const Color &value);
+    const ColorDiff *produceDiff(const Color &value) const;
+    virtual void generateInitDiffs(vector<const DefinitionDiff *> *diffs) const override;
+    virtual bool applyDiff(const DefinitionDiff *diff, bool backward = false) override;
+
+  private:
+    Color value;
+};
+}
+}
+
+#endif // COLORNODE_H
diff --git a/src/definition/DefinitionNode.cpp b/src/definition/DefinitionNode.cpp
index d5c3483..bfffed7 100644
--- a/src/definition/DefinitionNode.cpp
+++ b/src/definition/DefinitionNode.cpp
@@ -249,6 +249,7 @@ void DefinitionNode::addDiff(const DefinitionDiff *diff) {
     if (root && root->diffs) {
         root->diffs->addDiff(this, diff);
     } else {
+        // TODO Apply diff ?
         delete diff;
     }
 }
diff --git a/src/definition/FloatNode.cpp b/src/definition/FloatNode.cpp
index f52a495..70f7a28 100644
--- a/src/definition/FloatNode.cpp
+++ b/src/definition/FloatNode.cpp
@@ -27,8 +27,8 @@ void FloatNode::load(PackStream *stream) {
 }
 
 void FloatNode::copy(DefinitionNode *destination) const {
-    if (destination->getTypeName() == getTypeName()) {
-        ((FloatNode *)destination)->value = value;
+    if (auto tdest = dynamic_cast<FloatNode *>(destination)) {
+        tdest->value = value;
     } else {
         Logs::error("Definition") << "Can't copy from " << getTypeName() << " to " << destination->getTypeName()
                                   << endl;
@@ -53,17 +53,22 @@ bool FloatNode::applyDiff(const DefinitionDiff *diff, bool backward) {
     }
 
     assert(diff->getTypeName() == "float");
-    const FloatDiff *float_diff = (const FloatDiff *)diff;
+    auto float_diff = dynamic_cast<const FloatDiff *>(diff);
 
-    double previous = backward ? float_diff->getNewValue() : float_diff->getOldValue();
-    double next = backward ? float_diff->getOldValue() : float_diff->getNewValue();
+    if (float_diff) {
+        double previous = backward ? float_diff->getNewValue() : float_diff->getOldValue();
+        double next = backward ? float_diff->getOldValue() : float_diff->getNewValue();
 
-    if (value == previous) {
-        value = next;
-        return true;
+        if (value == previous) {
+            value = next;
+            return true;
+        } else {
+            Logs::error("Definition") << "Can't apply float diff " << previous << " => " << next << " to " << getName()
+                                      << endl;
+            return false;
+        }
     } else {
-        Logs::error("Definition") << "Can't apply float diff " << previous << " => " << next << " to " << getName()
-                                  << endl;
+        Logs::error("Could not cast DefinitionDiff to IntDiff");
         return false;
     }
 }
diff --git a/src/definition/FloatNode.h b/src/definition/FloatNode.h
index 50f7170..c424018 100644
--- a/src/definition/FloatNode.h
+++ b/src/definition/FloatNode.h
@@ -31,7 +31,7 @@ class DEFINITIONSHARED_EXPORT FloatNode : public DefinitionNode {
      */
     void setValue(double new_value);
     const FloatDiff *produceDiff(double new_value) const;
-    void generateInitDiffs(vector<const DefinitionDiff *> *diffs) const;
+    virtual void generateInitDiffs(vector<const DefinitionDiff *> *diffs) const override;
     virtual bool applyDiff(const DefinitionDiff *diff, bool backward = false) override;
 
     void addValue(double added);
diff --git a/src/definition/IntNode.cpp b/src/definition/IntNode.cpp
index a552314..e676ced 100644
--- a/src/definition/IntNode.cpp
+++ b/src/definition/IntNode.cpp
@@ -27,8 +27,8 @@ void IntNode::load(PackStream *stream) {
 }
 
 void IntNode::copy(DefinitionNode *destination) const {
-    if (destination->getTypeName() == getTypeName()) {
-        ((IntNode *)destination)->value = value;
+    if (auto tdest = dynamic_cast<IntNode *>(destination)) {
+        tdest->value = value;
     } else {
         Logs::error("Definition") << "Can't copy from " << getTypeName() << " to " << destination->getTypeName()
                                   << endl;
@@ -53,17 +53,22 @@ bool IntNode::applyDiff(const DefinitionDiff *diff, bool backward) {
     }
 
     assert(diff->getTypeName() == "int");
-    const IntDiff *int_diff = (const IntDiff *)diff;
+    auto int_diff = dynamic_cast<const IntDiff *>(diff);
 
-    double previous = backward ? int_diff->getNewValue() : int_diff->getOldValue();
-    double next = backward ? int_diff->getOldValue() : int_diff->getNewValue();
+    if (int_diff) {
+        int previous = backward ? int_diff->getNewValue() : int_diff->getOldValue();
+        int next = backward ? int_diff->getOldValue() : int_diff->getNewValue();
 
-    if (value == previous) {
-        value = next;
-        return true;
+        if (value == previous) {
+            value = next;
+            return true;
+        } else {
+            Logs::error("Definition") << "Can't apply int diff " << previous << " => " << next << " to " << getName()
+                                      << endl;
+            return false;
+        }
     } else {
-        Logs::error("Definition") << "Can't apply int diff " << previous << " => " << next << " to " << getName()
-                                  << endl;
+        Logs::error("Could not cast DefinitionDiff to IntDiff");
         return false;
     }
 }
diff --git a/src/definition/IntNode.h b/src/definition/IntNode.h
index 4f23ce8..5c84a0d 100644
--- a/src/definition/IntNode.h
+++ b/src/definition/IntNode.h
@@ -31,7 +31,7 @@ class DEFINITIONSHARED_EXPORT IntNode : public DefinitionNode {
      */
     void setValue(int new_value);
     const IntDiff *produceDiff(int new_value) const;
-    void generateInitDiffs(vector<const DefinitionDiff *> *diffs) const;
+    virtual void generateInitDiffs(vector<const DefinitionDiff *> *diffs) const override;
     virtual bool applyDiff(const DefinitionDiff *diff, bool backward = false) override;
 
   private:
diff --git a/src/definition/WaterDefinition.cpp b/src/definition/WaterDefinition.cpp
index 4753571..5ba9723 100644
--- a/src/definition/WaterDefinition.cpp
+++ b/src/definition/WaterDefinition.cpp
@@ -2,19 +2,19 @@
 
 #include "PackStream.h"
 #include "NoiseState.h"
-#include "Color.h"
 #include "SurfaceMaterial.h"
 #include "IntNode.h"
 #include "FloatNode.h"
+#include "ColorNode.h"
 
 WaterDefinition::WaterDefinition(DefinitionNode *parent) : DefinitionNode(parent, "water", "water") {
     model = new IntNode(this, "model", -1);
     reflection = new FloatNode(this, "reflection");
     xoffset = new FloatNode(this, "xoffset");
     zoffset = new FloatNode(this, "zoffset");
+    depth_color = new ColorNode(this, "depth_color");
 
     material = new SurfaceMaterial;
-    depth_color = new Color;
     foam_material = new SurfaceMaterial;
     noise_state = new NoiseState();
 
@@ -32,7 +32,6 @@ WaterDefinition::WaterDefinition(DefinitionNode *parent) : DefinitionNode(parent
 
 WaterDefinition::~WaterDefinition() {
     delete material;
-    delete depth_color;
     delete foam_material;
     delete noise_state;
 }
@@ -41,7 +40,6 @@ void WaterDefinition::save(PackStream *stream) const {
     DefinitionNode::save(stream);
 
     material->save(stream);
-    depth_color->save(stream);
     stream->write(&transparency_depth);
     stream->write(&transparency);
     stream->write(&lighting_depth);
@@ -61,7 +59,6 @@ void WaterDefinition::load(PackStream *stream) {
     DefinitionNode::load(stream);
 
     material->load(stream);
-    depth_color->load(stream);
     stream->read(&transparency_depth);
     stream->read(&transparency);
     stream->read(&lighting_depth);
@@ -84,7 +81,6 @@ void WaterDefinition::copy(DefinitionNode *_destination) const {
 
     WaterDefinition *destination = (WaterDefinition *)_destination;
     *destination->material = *material;
-    *destination->depth_color = *depth_color;
     destination->transparency_depth = transparency_depth;
     destination->transparency = transparency;
     destination->lighting_depth = lighting_depth;
@@ -100,7 +96,6 @@ void WaterDefinition::copy(DefinitionNode *_destination) const {
 void WaterDefinition::validate() {
     DefinitionNode::validate();
 
-    depth_color->a = 1.0;
     material->base->a = 1.0;
     material->reflection = 1.0;
     material->shininess = 16.0;
@@ -116,17 +111,13 @@ void WaterDefinition::validate() {
 
 void WaterDefinition::nodeChanged(const DefinitionNode *node, const DefinitionDiff *) {
     if (node == model) {
-        noise_state->randomizeOffsets();
-
         switch (model->getValue()) {
         case 1:
             transparency = 0.3;
             reflection->setValue(0.07);
             transparency_depth = 3.0;
             material->setColor(0.05, 0.18, 0.2, 1.0);
-            depth_color->r = 0.0;
-            depth_color->g = 0.18;
-            depth_color->b = 0.15;
+            depth_color->setValue(Color(0.0, 0.18, 0.15));
             lighting_depth = 4.0;
             scaling = 1.5;
             waves_height = 1.0;
@@ -140,9 +131,7 @@ void WaterDefinition::nodeChanged(const DefinitionNode *node, const DefinitionDi
             reflection->setValue(0.2);
             transparency_depth = 4.0;
             material->setColor(0.08, 0.15, 0.2, 1.0);
-            depth_color->r = 0.0;
-            depth_color->g = 0.1;
-            depth_color->b = 0.1;
+            depth_color->setValue(Color(0.0, 0.1, 0.1));
             lighting_depth = 6.0;
             scaling = 1.0;
             waves_height = 0.8;
@@ -155,6 +144,8 @@ void WaterDefinition::nodeChanged(const DefinitionNode *node, const DefinitionDi
 }
 
 void WaterDefinition::applyPreset(WaterPreset preset, RandomGenerator &random) {
+    noise_state->randomizeOffsets(random);
+
     if (preset == WATER_PRESET_LAKE) {
         model->setValue(0);
     } else if (preset == WATER_PRESET_SEA) {
diff --git a/src/definition/WaterDefinition.h b/src/definition/WaterDefinition.h
index 4b4b4da..edfec38 100644
--- a/src/definition/WaterDefinition.h
+++ b/src/definition/WaterDefinition.h
@@ -32,6 +32,9 @@ class DEFINITIONSHARED_EXPORT WaterDefinition : public DefinitionNode, public De
     inline FloatNode *propZOffset() const {
         return zoffset;
     }
+    inline ColorNode *propDepthColor() const {
+        return depth_color;
+    }
 
     virtual void nodeChanged(const DefinitionNode *node, const DefinitionDiff *diff);
 
@@ -41,7 +44,6 @@ class DEFINITIONSHARED_EXPORT WaterDefinition : public DefinitionNode, public De
   public:
     double transparency;
     SurfaceMaterial *material;
-    Color *depth_color;
     double transparency_depth;
     double lighting_depth;
 
@@ -60,6 +62,7 @@ class DEFINITIONSHARED_EXPORT WaterDefinition : public DefinitionNode, public De
     FloatNode *reflection;
     FloatNode *xoffset;
     FloatNode *zoffset;
+    ColorNode *depth_color;
 };
 }
 }
diff --git a/src/definition/definition_global.h b/src/definition/definition_global.h
index ebf2a73..efc710e 100644
--- a/src/definition/definition_global.h
+++ b/src/definition/definition_global.h
@@ -18,6 +18,8 @@ class FloatDiff;
 class IntNode;
 class IntDiff;
 class NoiseNode;
+class ColorNode;
+class ColorDiff;
 class DiffManager;
 class DefinitionWatcher;
 class Scenery;
diff --git a/src/render/software/WaterRenderer.cpp b/src/render/software/WaterRenderer.cpp
index 4f058f6..8ffd701 100644
--- a/src/render/software/WaterRenderer.cpp
+++ b/src/render/software/WaterRenderer.cpp
@@ -10,6 +10,7 @@
 #include "SurfaceMaterial.h"
 #include "NoiseFunctionSimplex.h"
 #include "FloatNode.h"
+#include "ColorNode.h"
 #include "RayCastingResult.h"
 
 WaterRenderer::WaterRenderer(SoftwareRenderer *parent) : parent(parent) {
@@ -178,7 +179,7 @@ WaterRenderer::WaterResult WaterRenderer::getResult(double x, double z) {
     if (definition->transparency == 0.0) {
         result.refracted = COLOR_BLACK;
     } else {
-        Color depth_color = *definition->depth_color;
+        Color depth_color = definition->propDepthColor()->getValue();
         refracted = parent->rayWalking(location, _refractRay(look_direction, normal), 1, 0, 1, 1);
         depth = location.sub(refracted.hit_location).getNorm();
         depth_color.limitPower(refracted.hit_color.getPower());
diff --git a/src/tests/ColorNode_Test.cpp b/src/tests/ColorNode_Test.cpp
new file mode 100644
index 0000000..5a6f71b
--- /dev/null
+++ b/src/tests/ColorNode_Test.cpp
@@ -0,0 +1,108 @@
+#include "BaseTestCase.h"
+
+#include "ColorNode.h"
+#include "ColorDiff.h"
+#include "IntDiff.h"
+#include "PackStream.h"
+
+TEST(ColorNode, toString) {
+    ColorNode test(NULL, "test", Color(0.1, 0.2, 0.3, 0.4));
+
+    EXPECT_EQ("test 0.1,0.2,0.3,0.4", test.toString(0));
+    EXPECT_EQ("  test 0.1,0.2,0.3,0.4", test.toString(2));
+}
+
+TEST(ColorNode, saveLoadAndSkip) {
+    DefinitionNode root1(NULL, "root");
+    ColorNode testa1(&root1, "testa", COLOR_RED);
+    ColorNode testb1(&root1, "testb", COLOR_GREEN);
+
+    PackStream stream1;
+    root1.save(&stream1);
+
+    DefinitionNode root2(NULL, "root");
+    ColorNode testb2(&root2, "testb");
+
+    PackStream stream2(&stream1);
+    root2.load(&stream2);
+
+    EXPECT_EQ(COLOR_GREEN, testb2.getValue());
+}
+
+TEST(ColorNode, copy) {
+    ColorNode base(NULL, "test", COLOR_BLUE);
+    ColorNode other(NULL, "test", COLOR_RED);
+    DefinitionNode badother(NULL, "test");
+
+    base.copy(&other);
+    EXPECT_EQ(COLOR_BLUE, base.getValue());
+    EXPECT_EQ(COLOR_BLUE, other.getValue());
+
+    badother.copy(&base);
+    EXPECT_EQ(COLOR_BLUE, base.getValue());
+
+    base.copy(&badother);
+    // can't check anything, just useful in valgrind
+}
+
+TEST(ColorNode, produceDiff) {
+    ColorNode node(NULL, "test", COLOR_BLUE);
+    const ColorDiff *diff = node.produceDiff(COLOR_RED);
+
+    EXPECT_EQ("color", diff->getTypeName());
+    EXPECT_EQ(COLOR_BLUE, diff->getOldValue());
+    EXPECT_EQ(COLOR_RED, diff->getNewValue());
+
+    bool result = node.applyDiff(diff);
+
+    EXPECT_TRUE(result);
+    EXPECT_EQ(COLOR_RED, node.getValue());
+
+    delete diff;
+}
+
+TEST(ColorNode, applyDiff) {
+    ColorNode node(NULL, "test", COLOR_BLUE);
+    ColorDiff diff(&node, COLOR_BLUE, COLOR_RED);
+    DefinitionNode onode(NULL, "test", "badtype");
+    IntDiff odiff(&onode, 1, 2);
+    bool result;
+
+    EXPECT_EQ(COLOR_BLUE, node.getValue());
+
+    // apply
+    result = node.applyDiff(&diff);
+
+    EXPECT_TRUE(result);
+    EXPECT_EQ(COLOR_RED, node.getValue());
+
+    // can't apply twice
+    result = node.applyDiff(&diff);
+
+    EXPECT_FALSE(result);
+    EXPECT_EQ(COLOR_RED, node.getValue());
+
+    // reverse
+    result = node.applyDiff(&diff, true);
+
+    EXPECT_TRUE(result);
+    EXPECT_EQ(COLOR_BLUE, node.getValue());
+
+    // can't reverse twice
+    result = node.applyDiff(&diff, true);
+
+    EXPECT_FALSE(result);
+    EXPECT_EQ(COLOR_BLUE, node.getValue());
+
+    // bad type
+    result = node.applyDiff(&odiff);
+
+    EXPECT_FALSE(result);
+    EXPECT_EQ(COLOR_BLUE, node.getValue());
+
+    // apply again
+    result = node.applyDiff(&diff);
+
+    EXPECT_TRUE(result);
+    EXPECT_EQ(COLOR_RED, node.getValue());
+}