diff --git a/lint/plugin.js b/lint/plugin.js
index d2e43fe62..a7af77d7d 100644
--- a/lint/plugin.js
+++ b/lint/plugin.js
@@ -533,6 +533,44 @@ const noMathRandom = {
   }
 }
 
+function isNumericLiteral(node, value) {
+  return node?.type === 'Literal' && node.value === value
+}
+
+function colorObjectLiteral(node, color) {
+  if (node?.type !== 'ObjectExpression') return false
+  const props = new Map()
+  for (const prop of node.properties ?? []) {
+    if (prop.type !== 'Property') return false
+    const key = prop.key.type === 'Identifier' ? prop.key.name : prop.key.value
+    props.set(key, prop.value)
+  }
+  return Object.entries(color).every(([key, value]) => isNumericLiteral(props.get(key), value))
+}
+
+const noHardcodedColorConstants = {
+  meta: {
+    docs: {
+      description: 'Use named color constants instead of inline Color object literals for shared colors'
+    }
+  },
+  create(context) {
+    const file = normalizedFilename(context)
+    if (file.includes('/tests/') || file.endsWith('/packages/core/src/constants.ts')) return {}
+
+    return {
+      ObjectExpression(node) {
+        if (colorObjectLiteral(node, { r: 0, g: 0, b: 0, a: 1 })) {
+          context.report({ node, message: 'Use BLACK from constants instead of an inline black Color literal.' })
+        }
+        if (colorObjectLiteral(node, { r: 0, g: 0, b: 0, a: 0 })) {
+          context.report({ node, message: 'Use TRANSPARENT from constants instead of an inline transparent Color literal.' })
+        }
+      }
+    }
+  }
+}
+
 const noHandRolledColor = {
   meta: {
     docs: {
@@ -1553,6 +1591,7 @@ const plugin = {
     'no-document-query-selector-in-vue': noDocumentQuerySelectorInVue,
     'no-direct-selection-tool-state-mutation': noDirectSelectionToolStateMutation,
     'no-math-random': noMathRandom,
+    'no-hardcoded-color-constants': noHardcodedColorConstants,
     'no-hand-rolled-color': noHandRolledColor,
     'no-raw-console-format': noRawConsoleFormat,
     'no-silent-catch': noSilentCatch,
diff --git a/oxlint.json b/oxlint.json
index d7e7c4ada..b9889dbec 100644
--- a/oxlint.json
+++ b/oxlint.json
@@ -122,6 +122,7 @@
     "open-pencil/no-document-query-selector-in-vue": "error",
     "open-pencil/no-direct-selection-tool-state-mutation": "error",
     "open-pencil/no-math-random": "error",
+    "open-pencil/no-hardcoded-color-constants": "error",
     "open-pencil/no-hand-rolled-color": "error",
     "open-pencil/no-raw-console-format": "off",
     "open-pencil/no-silent-catch": "error",
diff --git a/packages/core/src/editor/clipboard/images.ts b/packages/core/src/editor/clipboard/images.ts
index f5bcf93a2..9cf5e0774 100644
--- a/packages/core/src/editor/clipboard/images.ts
+++ b/packages/core/src/editor/clipboard/images.ts
@@ -1,3 +1,4 @@
+import { TRANSPARENT } from '#core/constants'
 import { resolvePasteTarget } from '#core/editor/clipboard/paste-target'
 import type { EditorContext } from '#core/editor/types'
 import { computeImageHash } from '#core/figma-api'
@@ -44,7 +45,7 @@ export function createClipboardImageActions(ctx: EditorContext) {
       type: 'IMAGE',
       imageHash: hash,
       imageScaleMode: 'FILL',
-      color: { r: 0, g: 0, b: 0, a: 0 },
+      color: TRANSPARENT,
       opacity: 1,
       visible: true
     }
diff --git a/packages/core/src/editor/shapes.ts b/packages/core/src/editor/shapes.ts
index 7153b1039..f8b00f88c 100644
--- a/packages/core/src/editor/shapes.ts
+++ b/packages/core/src/editor/shapes.ts
@@ -1,4 +1,5 @@
 import {
+  BLACK,
   DEFAULT_FRAME_FILL,
   DEFAULT_SHAPE_FILL,
   SECTION_DEFAULT_FILL,
@@ -13,7 +14,7 @@ export type { PenDragOptions } from './shapes/pen'
 
 const BLACK_FILL: Fill = {
   type: 'SOLID',
-  color: { r: 0, g: 0, b: 0, a: 1 },
+  color: BLACK,
   opacity: 1,
   visible: true
 }
diff --git a/packages/core/src/editor/shapes/pen.ts b/packages/core/src/editor/shapes/pen.ts
index 7d8e7b3c8..9befdf2bb 100644
--- a/packages/core/src/editor/shapes/pen.ts
+++ b/packages/core/src/editor/shapes/pen.ts
@@ -1,3 +1,4 @@
+import { BLACK } from '#core/constants'
 import type { EditorContext } from '#core/editor/types'
 import type { SceneNode, VectorNetwork, VectorRegion, VectorSegment } from '#core/scene-graph'
 import type { Vector } from '#core/types'
@@ -19,7 +20,7 @@ type CreateShape = (
 ) => string
 
 const PEN_DEFAULT_STROKE: SceneNode['strokes'][number] = {
-  color: { r: 0, g: 0, b: 0, a: 1 },
+  color: BLACK,
   weight: 2,
   opacity: 1,
   visible: true,
diff --git a/packages/core/src/io/formats/pen/convert.ts b/packages/core/src/io/formats/pen/convert.ts
index 87468c8fc..1cd424c9f 100644
--- a/packages/core/src/io/formats/pen/convert.ts
+++ b/packages/core/src/io/formats/pen/convert.ts
@@ -1,4 +1,5 @@
 import { parseColor } from '#core/color'
+import { BLACK } from '#core/constants'
 import { generateId } from '#core/scene-graph'
 import type {
   Color,
@@ -136,7 +137,7 @@ function penValueToSceneValue(raw: string | number, type: VariableType): Variabl
 }
 
 function defaultForType(type: VariableType): VariableValue {
-  if (type === 'COLOR') return { r: 0, g: 0, b: 0, a: 1 }
+  if (type === 'COLOR') return { ...BLACK }
   if (type === 'FLOAT') return 0
   if (type === 'BOOLEAN') return false
   return ''
@@ -252,7 +253,7 @@ export function buildVarContext(
       if (val === undefined) return parseColor(ref)
       if (typeof val === 'object' && 'r' in val) return val
       if (typeof val === 'string') return parseColor(val)
-      return { r: 0, g: 0, b: 0, a: 1 }
+      return { ...BLACK }
     },
     resolveNumber(ref: string): number {
       const val = resolveVal(ref)
diff --git a/packages/core/src/kiwi/fig/import.ts b/packages/core/src/kiwi/fig/import.ts
index 31229bbb0..36c9b94aa 100644
--- a/packages/core/src/kiwi/fig/import.ts
+++ b/packages/core/src/kiwi/fig/import.ts
@@ -1,3 +1,4 @@
+import { BLACK } from '#core/constants'
 import type { NodeChange, VariableDataValuesEntry, Color, GUID } from '#core/kiwi/binary/codec'
 import { populateAndApplyOverrides } from '#core/kiwi/instance-overrides'
 import type { InstanceNodeChange } from '#core/kiwi/instance-overrides'
@@ -164,7 +165,7 @@ function resolveVariableValue(
 function resolveDefaultValue(type: VariableType): VariableValue {
   if (type === 'BOOLEAN') return false
   if (type === 'STRING') return ''
-  if (type === 'COLOR') return { r: 0, g: 0, b: 0, a: 1 }
+  if (type === 'COLOR') return { ...BLACK }
   return 0
 }
 
diff --git a/packages/core/src/scene-graph/node-defaults.ts b/packages/core/src/scene-graph/node-defaults.ts
index c140cfee1..590194476 100644
--- a/packages/core/src/scene-graph/node-defaults.ts
+++ b/packages/core/src/scene-graph/node-defaults.ts
@@ -1,4 +1,4 @@
-import { DEFAULT_FONT_FAMILY, DEFAULT_STROKE_MITER_LIMIT } from '#core/constants'
+import { BLACK, DEFAULT_FONT_FAMILY, DEFAULT_STROKE_MITER_LIMIT } from '#core/constants'
 
 import type { NodeType, SceneNode } from './types'
 
@@ -21,7 +21,7 @@ export function createDefaultNode(
     figmaDerivedLayout: null,
     fills:
       type === 'TEXT'
-        ? [{ type: 'SOLID' as const, color: { r: 0, g: 0, b: 0, a: 1 }, opacity: 1, visible: true }]
+        ? [{ type: 'SOLID' as const, color: BLACK, opacity: 1, visible: true }]
         : [],
     strokes: [],
     effects: [],
diff --git a/packages/core/src/tools/modify/effects.ts b/packages/core/src/tools/modify/effects.ts
index 5b51299c1..d17471b38 100644
--- a/packages/core/src/tools/modify/effects.ts
+++ b/packages/core/src/tools/modify/effects.ts
@@ -1,5 +1,5 @@
 import { parseColor } from '#core/color'
-import { DEFAULT_SHADOW_COLOR } from '#core/constants'
+import { DEFAULT_SHADOW_COLOR, TRANSPARENT } from '#core/constants'
 import type { Effect } from '#core/scene-graph'
 import { defineTool, nodeNotFound } from '#core/tools/schema'
 
@@ -28,7 +28,7 @@ export const setEffects = defineTool({
 
     const isBlur = args.type === 'FOREGROUND_BLUR' || args.type === 'BACKGROUND_BLUR'
     let color = { ...DEFAULT_SHADOW_COLOR }
-    if (isBlur) color = { r: 0, g: 0, b: 0, a: 0 }
+    if (isBlur) color = { ...TRANSPARENT }
     else if (args.color) color = parseColor(args.color)
     const effect: Effect = {
       type: args.type as Effect['type'],
diff --git a/packages/core/src/tools/modify/paint.ts b/packages/core/src/tools/modify/paint.ts
index 05fca8176..a747e020a 100644
--- a/packages/core/src/tools/modify/paint.ts
+++ b/packages/core/src/tools/modify/paint.ts
@@ -1,4 +1,5 @@
 import { parseColor } from '#core/color'
+import { BLACK } from '#core/constants'
 import { defineTool } from '#core/tools/schema'
 import type { Matrix } from '#core/types'
 
@@ -116,7 +117,7 @@ export const setImageFill = defineTool({
     node.fills = [
       {
         type: 'IMAGE',
-        color: { r: 0, g: 0, b: 0, a: 1 },
+        color: BLACK,
         opacity: 1,
         visible: true,
         imageHash: image.hash,
diff --git a/packages/vue/src/controls/okhcl/helpers.ts b/packages/vue/src/controls/okhcl/helpers.ts
index a15215f0e..52d0bb6ad 100644
--- a/packages/vue/src/controls/okhcl/helpers.ts
+++ b/packages/vue/src/controls/okhcl/helpers.ts
@@ -1,5 +1,6 @@
 import type { Ref } from 'vue'
 
+import { BLACK } from '@open-pencil/core/constants'
 import {
   getFillOkHCL,
   getStrokeOkHCL,
@@ -31,14 +32,14 @@ export function getStrokeOkHCLColor(node: SceneNode | null, index: number): OkHC
 function fallbackFillOkHCL(node: SceneNode, index: number) {
   return (
     getFillOkHCLColor(node, index) ??
-    rgbaToOkHCL(node.fills[index]?.color ?? { r: 0, g: 0, b: 0, a: 1 })
+    rgbaToOkHCL(node.fills[index]?.color ?? BLACK)
   )
 }
 
 function fallbackStrokeOkHCL(node: SceneNode, index: number) {
   return (
     getStrokeOkHCLColor(node, index) ??
-    rgbaToOkHCL(node.strokes[index]?.color ?? { r: 0, g: 0, b: 0, a: 1 })
+    rgbaToOkHCL(node.strokes[index]?.color ?? BLACK)
   )
 }
 
diff --git a/packages/vue/src/controls/stroke/helpers.ts b/packages/vue/src/controls/stroke/helpers.ts
index c600ea438..c8f5b23be 100644
--- a/packages/vue/src/controls/stroke/helpers.ts
+++ b/packages/vue/src/controls/stroke/helpers.ts
@@ -1,5 +1,6 @@
 import type { Ref } from 'vue'
 
+import { BLACK } from '@open-pencil/core/constants'
 import type { Editor } from '@open-pencil/core/editor'
 import type { SceneNode, Stroke } from '@open-pencil/core/scene-graph'
 
@@ -16,7 +17,7 @@ export const SIDE_OPTIONS: { value: StrokeSides; label: string }[] = [
 
 export const BORDER_SIDES = ['top', 'right', 'bottom', 'left'] as const
 export const DEFAULT_STROKE: Stroke = {
-  color: { r: 0, g: 0, b: 0, a: 1 },
+  color: BLACK,
   weight: 1,
   opacity: 1,
   visible: true,
diff --git a/packages/vue/src/variables/helpers.ts b/packages/vue/src/variables/helpers.ts
index c4a17ee20..9b0102481 100644
--- a/packages/vue/src/variables/helpers.ts
+++ b/packages/vue/src/variables/helpers.ts
@@ -1,5 +1,6 @@
 import type { Ref } from 'vue'
 
+import { BLACK } from '@open-pencil/core/constants'
 import { colorToHexRaw, parseColor } from '@open-pencil/core/color'
 import type { Editor } from '@open-pencil/core/editor'
 import { randomHex } from '@open-pencil/core/random'
@@ -93,7 +94,7 @@ export function createVariableValueActions(
   getActiveCollection: () => VariableCollection | null
 ) {
   function defaultVariableValue(type: VariableType): VariableValue {
-    if (type === 'COLOR') return { r: 0, g: 0, b: 0, a: 1 }
+    if (type === 'COLOR') return { ...BLACK }
     if (type === 'FLOAT') return 0
     if (type === 'BOOLEAN') return false
     return ''
diff --git a/src/app/demo/colors.ts b/src/app/demo/colors.ts
index 999213029..8f3f9631c 100644
--- a/src/app/demo/colors.ts
+++ b/src/app/demo/colors.ts
@@ -1,7 +1,9 @@
+import { BLACK } from '@open-pencil/core/constants'
 import type { Color, Fill, GradientStop, Stroke } from '@open-pencil/core/scene-graph'
 
+export { BLACK }
+
 export const WHITE: Color = { r: 1, g: 1, b: 1, a: 1 }
-export const BLACK: Color = { r: 0, g: 0, b: 0, a: 1 }
 export const GRAY_50: Color = { r: 0.98, g: 0.98, b: 0.98, a: 1 }
 export const GRAY_100: Color = { r: 0.96, g: 0.96, b: 0.97, a: 1 }
 export const GRAY_200: Color = { r: 0.9, g: 0.9, b: 0.92, a: 1 }
diff --git a/src/app/demo/effects.ts b/src/app/demo/effects.ts
index ffead691d..536f9809a 100644
--- a/src/app/demo/effects.ts
+++ b/src/app/demo/effects.ts
@@ -1,3 +1,4 @@
+import { TRANSPARENT } from '@open-pencil/core/constants'
 import type { Color, Effect } from '@open-pencil/core/scene-graph'
 
 export function dropShadow(
@@ -37,7 +38,7 @@ export function innerShadow(
 export function blurEffect(type: Effect['type'], radius: number): Effect {
   return {
     type,
-    color: { r: 0, g: 0, b: 0, a: 0 },
+    color: TRANSPARENT,
     offset: { x: 0, y: 0 },
     radius,
     spread: 0,
diff --git a/tests/engine/render/canvas/boolean.test.ts b/tests/engine/render/canvas/boolean.test.ts
index 635934484..e19a76ee1 100644
--- a/tests/engine/render/canvas/boolean.test.ts
+++ b/tests/engine/render/canvas/boolean.test.ts
@@ -1,6 +1,7 @@
 import { describe, expect, test } from 'bun:test'
 
 import { initCanvasKit } from '#cli/headless'
+import { BLACK } from '#core/constants'
 import { makeBooleanOperationPath } from '#core/canvas/boolean'
 import { makeNodeShapePath, makePolygonPath, makeRRect } from '#core/canvas/shapes'
 import type { SkiaRenderer } from '#core/canvas/renderer'
@@ -144,8 +145,8 @@ describe('boolean operation paths', () => {
     expect(firstNode).toBeDefined()
     expect(secondNode).toBeDefined()
     if (!firstNode || !secondNode) return
-    firstNode.strokes = [{ type: 'SOLID', color: { r: 0, g: 0, b: 0, a: 1 }, opacity: 1, visible: true, weight: 12, align: 'CENTER' }]
-    secondNode.strokes = [{ type: 'SOLID', color: { r: 0, g: 0, b: 0, a: 1 }, opacity: 1, visible: true, weight: 12, align: 'CENTER' }]
+    firstNode.strokes = [{ type: 'SOLID', color: BLACK, opacity: 1, visible: true, weight: 12, align: 'CENTER' }]
+    secondNode.strokes = [{ type: 'SOLID', color: BLACK, opacity: 1, visible: true, weight: 12, align: 'CENTER' }]
 
     const booleanNode = api.union([first, second], api.currentPage)
     const node = api.graph.getNode(booleanNode.id)