diff --git a/spine-ts/spine-construct3/spine-construct3-lib/src/AssetLoader.ts b/spine-ts/spine-construct3/spine-construct3-lib/src/AssetLoader.ts
index 6439cdce2..12f52abb0 100644
--- a/spine-ts/spine-construct3/spine-construct3-lib/src/AssetLoader.ts
+++ b/spine-ts/spine-construct3/spine-construct3-lib/src/AssetLoader.ts
@@ -217,7 +217,6 @@ export class AssetLoader {
 
 	static async createImageBitmapFromBlob (blob: Blob, pma: boolean): Promise<ImageBitmap | null> {
 		try {
-			// pma parameters seems to do not matter here. It matters in C3 Texture creation
 			return createImageBitmap(blob, { premultiplyAlpha: pma ? "none" : "premultiply" });
 		} catch (e) {
 			console.error("Failed to create ImageBitmap from blob:", e);
diff --git a/spine-ts/spine-construct3/src/c3runtime/instance.ts b/spine-ts/spine-construct3/src/c3runtime/instance.ts
index 0cc03330d..c933eecb7 100644
--- a/spine-ts/spine-construct3/src/c3runtime/instance.ts
+++ b/spine-ts/spine-construct3/src/c3runtime/instance.ts
@@ -184,13 +184,14 @@ class SpineC3Instance extends globalThis.ISDKWorldInstanceBase {
 				vertices[dstIndex + 1] = y;
 				vertices[dstIndex + 2] = 0;
 
-				// there's something wrong with the hand after adding the colors on spineboy portal animation
 				const color = colors[i];
 				const colorDst = i * 4;
-				c3colors[colorDst] = (color >>> 16 & 0xFF) * inv255;
-				c3colors[colorDst + 1] = (color >>> 8 & 0xFF) * inv255;
-				c3colors[colorDst + 2] = (color & 0xFF) * inv255;
-				c3colors[colorDst + 3] = (color >>> 24 & 0xFF) * inv255 * this.opacity;
+				const alpha = (color >>> 24 & 0xFF) * inv255 * this.opacity;
+				const alphaInverse = inv255 * alpha;
+				c3colors[colorDst] = (color >>> 16 & 0xFF) * alphaInverse;
+				c3colors[colorDst + 1] = (color >>> 8 & 0xFF) * alphaInverse;
+				c3colors[colorDst + 2] = (color & 0xFF) * alphaInverse;
+				c3colors[colorDst + 3] = alpha;
 			}
 
 			renderer.setTexture(command.texture.texture);