I have 3 black and white drawings (with no tone) - each representing a colour layer in the picture. I want to create the effect of a three colour separation lithographic print (with the layers semi opaque) so that the colours overlay each other. e.g. if a blue layer overlaps a yellow layer, then green is made.
How might I do this? Each black drawing needs to be solidly coloured, then I need to layer them over each other.
Are there mezzotint options if I wanted to change the solid areas to textures?
Is there a fill that looks like the colour is made by traditional print-making?
(Complete beginner with Affinity Designer.)