So I saw this post https://e621.net/posts/4026859 and was like “what is it called when there’s a line drawn to make two same colored areas more clearly shown?” Like the lines that are shown when the same colors are phasing or colliding together and then there’s a different color line drawn to make the two areas more distinguishable. For example, in the post I linked, the fox’s arm is the same color as his body, so there’s a different colored line drawn around his arm when his arm is inside the body area. I am asking this because I am a new artist and want to implement this type of line style into my drawings but don’t know what it’s called to properly google or search for it.