Interesting idea but it's very slow on my computers.

Very slow

Might be a cool effect but it runs extremely slow on my machine

Looks like watercolor indeed. But very slow.

nice one but very very slow on my laptop

Great idea, perfectly in-theme, with realistic ink diffusion. Unfortunately, getting and putting back ImageData at each frame is too slow. Have you tried other solutions, such as copying the canvas with partial transparency and composite operations??

I like the color mixing. It is very, very slow, though.