Hi all, recently I've been working on a project that requires me to show something similar to a time-lapse sequence in which dirt and grime accumulate on a surface. My thought about this was to use something like a fractal or noise node that has two colors, black and white. Start both as white, then keyframe one of them to gradually turn black. However, the result looks more like a video cross-dissolve between two sets of footage. The pattern doesn't really "grow," it just fades in. I've tried messing around with various other settings but I'm stumped at this point. Does anyone have some suggestions as to how to achieve this kind of effect?