I want to make sprite indicate the RGBA color.
I've already done with showing colors, but I can't apply transparency/opacity to them.

https://scratch.mit.edu/projects/904774704/

(The ball on the left is a ball made by shape for color comparison. Right ball is what Im trying)
It works well on a white background, but on other backgrounds (especially black backgrounds), you can see the color appearing too white.


It's obvious that there's something wrong with the stamping process, but I don't know what to do.
Is there a way to fix this?

For pen, there is a block saying: SET COLOUR TO ____
there's an arrow, click it.
There is transparency option. Change it
Use it in the variable
It should work after that