diff --git a/src/Integrations/Divi/Design/ColorArea.php b/src/Integrations/Divi/Design/ColorArea.php
new file mode 100644
index 0000000..d5e9e04
--- /dev/null
+++ b/src/Integrations/Divi/Design/ColorArea.php
@@ -0,0 +1,102 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\Divi\Design;
+
+use LIT\MCP\Integrations\Divi\Release\DiviFeature;
+
+defined('ABSPATH') || exit;
+
+/**
+ * The area "colors" (spec §7.1, rulings V3, V4): the global colors as ColorBook reads them through
+ * GlobalColorsAdapter (the five main colors from et_divi, their lastUpdated empty). A change writes only the new and
+ * changed colors – merged, the way Divi's builder saves –, compared with the inventory read right before; a restore
+ * (and a rollback) replaces all stored colors with the snapshot. Divi's sanitizing may change values: verify() only
+ * insists on the same colors with the same status, differences() names the colors whose values changed.
+ */
+final class ColorArea implements DesignArea
+{
+    public function __construct(private GlobalColorsAdapter $colors)
+    {
+    }
+
+    public function name(): string
+    {
+        return 'colors';
+    }
+
+    public function label(): string
+    {
+        return 'Farben';
+    }
+
+    public function feature(): DiviFeature
+    {
+        return DiviFeature::ColorWrite;
+    }
+
+    public function raw(): array
+    {
+        return ColorBook::fromDivi($this->colors->read())->data();
+    }
+
+    public function rev(array $raw): string
+    {
+        return ColorBook::fromDivi($raw)->rev();
+    }
+
+    public function write(array $raw, bool $mayRemove): array
+    {
+        $planned = ColorBook::fromDivi($raw);
+        if ($mayRemove) {
+            $this->colors->save($planned->data(), true);
+
+            return $this->raw();
+        }
+
+        $changed = $planned->changedSince(ColorBook::fromDivi($this->colors->read()));
+        if ($changed !== []) {
+            $this->colors->save($changed, false);
+        }
+
+        return $this->raw();
+    }
+
+    public function restore(array $raw): array
+    {
+        return $this->write($raw, true);
+    }
+
+    public function verify(array $expected, array $actual): bool
+    {
+        return self::statuses($expected) === self::statuses($actual);
+    }
+
+    public function differences(array $expected, array $actual): array
+    {
+        $warnings = [];
+        foreach (ColorDiff::between(ColorBook::fromDivi($expected), ColorBook::fromDivi($actual)) as $row) {
+            if ($row['action'] === 'changed') {
+                $warnings[] = sprintf('Divi hat die Farbe „%s“ beim Speichern bereinigt.', $row['name']);
+            }
+        }
+
+        return $warnings;
+    }
+
+    /**
+     * @param array<array-key, mixed> $raw
+     * @return array<string, string> ID => status, sorted by ID
+     */
+    private static function statuses(array $raw): array
+    {
+        $statuses = array_map(
+            static fn (array $entry): string => (string) $entry['status'],
+            ColorBook::fromDivi($raw)->data()
+        );
+        ksort($statuses);
+
+        return $statuses;
+    }
+}
diff --git a/tests/Unit/Integrations/Divi/Design/ColorAreaTest.php b/tests/Unit/Integrations/Divi/Design/ColorAreaTest.php
new file mode 100644
index 0000000..7c2c1b1
--- /dev/null
+++ b/tests/Unit/Integrations/Divi/Design/ColorAreaTest.php
@@ -0,0 +1,163 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Tests\Unit\Integrations\Divi\Design;
+
+use LIT\MCP\Integrations\Divi\Compose\VariableRef;
+use LIT\MCP\Integrations\Divi\Design\ColorArea;
+use LIT\MCP\Integrations\Divi\Design\ColorBook;
+use LIT\MCP\Integrations\Divi\Design\GlobalColorsAdapter;
+use LIT\MCP\Integrations\Divi\Release\DiviFeature;
+use LIT\MCP\Tests\Unit\TestCase;
+use Mockery;
+
+final class ColorAreaTest extends TestCase
+{
+    /**
+     * GlobalColorsAdapter::read(): the main color primary, the color Holz dunkel and the relative color Sand built
+     * on it.
+     *
+     * @return array<string, array<string, mixed>>
+     */
+    public static function stored(): array
+    {
+        return [
+            'gcid-primary-color' => ['color' => '#2ea3f2', 'folder' => 'customizer', 'label' => 'Primärfarbe',
+                'lastUpdated' => '2026-10-19T08:00:00.000Z', 'status' => 'active', 'usedInPosts' => []],
+            'gcid-holz000001' => ['color' => '#5b3a29', 'folder' => '', 'label' => 'Holz dunkel',
+                'lastUpdated' => '2026-10-01T10:00:00.000Z', 'status' => 'active', 'usedInPosts' => []],
+            'gcid-sand000002' => ['color' => VariableRef::serialize('color', 'gcid-holz000001', ['lightness' => 40]),
+                'folder' => '', 'label' => 'Sand', 'lastUpdated' => '2026-10-01T10:00:00.000Z', 'status' => 'active',
+                'usedInPosts' => []],
+        ];
+    }
+
+    /**
+     * A GlobalColorsAdapter over $stored: save() merges (replace false) or replaces (true) like set_global_colors()
+     * and notes each call in $saves.
+     *
+     * @param array<string, array<string, mixed>>                 $stored
+     * @param list<array{0: array<string, mixed>, 1: bool}>       $saves
+     */
+    public static function adapter(array &$stored, array &$saves): GlobalColorsAdapter
+    {
+        $colors = Mockery::mock(GlobalColorsAdapter::class);
+        $colors->allows('read')->andReturnUsing(static function () use (&$stored): array {
+            return $stored;
+        });
+        $colors->allows('save')->andReturnUsing(
+            static function (array $entries, bool $replace) use (&$stored, &$saves): void {
+                $saves[] = [$entries, $replace];
+                $stored = $replace ? $entries : array_merge($stored, $entries);
+            }
+        );
+
+        return $colors;
+    }
+
+    /**
+     * @param array<string, array<string, mixed>> $stored
+     * @param array<string, mixed>                $fields
+     * @return array<string, array<string, mixed>>
+     */
+    private static function changed(array $stored, string $id, array $fields): array
+    {
+        $stored[$id] = $fields + $stored[$id];
+
+        return $stored;
+    }
+
+    /** @return array<string, mixed> */
+    private static function white(): array
+    {
+        return ['color' => '#ffffff', 'folder' => '', 'label' => 'Weiß', 'lastUpdated' => '2026-10-19T09:00:00.000Z',
+            'status' => 'active', 'usedInPosts' => []];
+    }
+
+    public function testAreaReadsThroughTheAdapter(): void
+    {
+        $stored = self::stored();
+        $saves = [];
+        $area = new ColorArea(self::adapter($stored, $saves));
+
+        self::assertSame(['colors', 'Farben'], [$area->name(), $area->label()]);
+        self::assertSame(DiviFeature::ColorWrite, $area->feature());
+        self::assertSame(ColorBook::fromDivi($stored)->data(), $area->raw());
+        self::assertSame(ColorBook::fromDivi($stored)->rev(), $area->rev($stored));
+    }
+
+    /** Ruling V4: only new and changed colors are merged; the unchanged main color is not written again. */
+    public function testWriteSavesOnlyNewAndChangedColorsAndReadsBack(): void
+    {
+        $stored = self::stored();
+        $saves = [];
+        $area = new ColorArea(self::adapter($stored, $saves));
+        $planned = self::changed(self::stored(), 'gcid-holz000001', ['color' => '#000000']);
+        $planned['gcid-neu0000003'] = self::white();
+
+        $saved = $area->write($planned, false);
+
+        self::assertCount(1, $saves);
+        self::assertFalse($saves[0][1], 'merge, never replace');
+        $keys = array_keys($saves[0][0]);
+        sort($keys);
+        self::assertSame(['gcid-holz000001', 'gcid-neu0000003'], $keys);
+        self::assertSame('#000000', $saved['gcid-holz000001']['color']);
+        self::assertSame(ColorBook::fromDivi($stored)->data(), $saved);
+    }
+
+    public function testWriteWithoutChangesSavesNothing(): void
+    {
+        $stored = self::stored();
+        $saves = [];
+
+        (new ColorArea(self::adapter($stored, $saves)))->write(self::stored(), false);
+
+        self::assertSame([], $saves);
+    }
+
+    /** Ruling V4: a restore (and a rollback) replaces all stored colors with the snapshot. */
+    public function testRestoreReplacesAllColorsWithTheSnapshot(): void
+    {
+        $stored = self::changed(self::stored(), 'gcid-holz000001', ['color' => '#000000']);
+        $stored['gcid-neu0000003'] = self::white();
+        $saves = [];
+        $area = new ColorArea(self::adapter($stored, $saves));
+        $snapshot = ColorBook::fromDivi(self::stored())->data();
+
+        $saved = $area->restore($snapshot);
+
+        self::assertSame([[$snapshot, true]], $saves);
+        self::assertSame($snapshot, $saved);
+    }
+
+    public function testVerifyInsistsOnTheSameColorsWithTheSameStatus(): void
+    {
+        $stored = self::stored();
+        $saves = [];
+        $area = new ColorArea(self::adapter($stored, $saves));
+        $expected = self::stored();
+        $missing = $expected;
+        unset($missing['gcid-sand000002']);
+
+        self::assertTrue($area->verify($expected, self::changed($expected, 'gcid-holz000001', ['color' => '#5B3A29'])));
+        self::assertFalse($area->verify($expected, $missing));
+        $inactive = self::changed($expected, 'gcid-holz000001', ['status' => 'inactive']);
+        self::assertFalse($area->verify($expected, $inactive));
+    }
+
+    public function testDifferencesNameTheColorsDiviChanged(): void
+    {
+        $stored = self::stored();
+        $saves = [];
+        $area = new ColorArea(self::adapter($stored, $saves));
+        $expected = self::stored();
+
+        self::assertSame([], $area->differences($expected, $expected));
+        self::assertSame(
+            ['Divi hat die Farbe „Holz dunkel“ beim Speichern bereinigt.'],
+            $area->differences($expected, self::changed($expected, 'gcid-holz000001', ['color' => '#5B3A29']))
+        );
+    }
+}