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Thanks the explanations, so briefly
- Stained glass 0% that is equal to "adding zero white"?
- Bleach 0% that is equal to "adding zero black"?

88595

But sorry if lost somewhere, it is also...

Ah okay thanks :-) And that by myself found out that on the second picture that is why the background is black, because that makes visible the original colours as black + 0% bleach transparency
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I also thanks this is very interesting topic :-)

Bill, basically how did you do these circles in steps? Because somehow for me came out differently :D The stained glass transparency should be set...