Two attempts, on the left red printed on top of yellow and on the right yellow printed on top of red. The second one gives a slight idea of an orange colour, but I probably should try some extender. In which case should I add it to the top colour only or both?
I have been working on this image (along with a couple more) trying to find something that works well, and that I can make a small edition of, to submit for the RA summer exhibition... still haven't got it quite right yet. But here are some of my trials.