I don’t know why, but you can’t make more than 8 layers for vertex color in Blender… I know vertex painting never was primary function in Blender, but still the fact i can bring it’s layers to the Node editor and include into material makes it super useful and fast for masking; unfortunately i found this limitation and it surprised me so much i decided to inform someone in charge to do something with it.
I don’t know if this problem is even that simple as I think, but making next masks on images and saving them all looks incomparably less comfy for workflow.
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That limit has been there since Vertex Color layers were added back in 2.3/2.4. It’s not related to the Code Quest, if you want to develop it and need guidance please use the Blender Development category in this forum.