I has to check the meaning of Monochrome because someone said on Facebook that black and white is achromatic. I’m pretty sure that means without colour. Like transparent liquids. But I wasn’t sure whether black and white was dichromatic or duochromatic? Anyway I think I was correct in my original suggestion. Words re such interesting things,
Mallaband-Brown 
I looked up for reference and now my brain hurts from all the different terms and words used to describe colours, visual perception and hues etc. Seems like most of them can overlap and almost be one and the same depending on context?
This link has others links with links to more links… might find a few links 😂 😂
https://graphicdesign.stackexchange.com/questions/134823/what-is-duochrome-duotone-called-when-it-had-more-than-2-colors
LikeLiked by 1 person
That’s great information. Lots to see. As I’m doing an illustration course it might be very useful. Thank you! ♥️
LikeLike