Color Deconvolution / "Depainting"

[oshfdk]

So my question to oshfdk is may it be tried to be discoloured also?

I can't separate layers of the same colour. I've tried looking at MSIs of the recto face, visually there is almost nothing there, you can have a look yourself. For the following image I cropped the corresponding part of You are not allowed to view links. Register or Login to view. from all MSI images, flipped horizontally and overlaid the flower with the center removed. It was very easy to match it more or less exactly, because the leaves from You are not allowed to view links. Register or Login to view. are clearly visible on f1r.

Until we have an MSI of You are not allowed to view links. Register or Login to view. or at least TX MSI of f1r, I think it's impossible to determine if there is some inscription there or just scribbles.