I'm guessing he's dyeing unexposed developed negatives with a dye to make masking masks, yes, this method is not as good as inkjet masks, and he also seems to be using your contrast mask process.
I guess he's using a dye to dye unexposed and developed negatives to make shielding masks. Yes, this method is not as good as inkjet masks. It seems that he's also using your contrast mask process.
I guess he is using a dye to dye the unexposed negative film to make a shielding mask. Yes, this method is not as good as the inkjet mask. It seems that he is also using your contrast mask process.