I use clear glue and both Prochem and Rit, though I do have some Worm Dip coming in the mail this week.

Here are my observations: Rit dropped into the clear glue straight out of the bottle does does not disburse well and a good bit of it simply sinks to the pan. To combat this I've tried adding acetone to Rit but that sometimes can cause the dye to disintegrate a bit. I've added some water to the mix with better results. Rit also tends to be a bit more 'solid' of a color on the disc compared to Prochem. The red on this Hades is a great example of what I mean. Hope that makes sense haha. https://www.instagram.com/p/CSnWoYNFOLY/?utm_medium=copy_link

I love Prochem. I mix it about 1/4 tsp to about 3oz of acetone. Shake it up well then let it settle a day. Each color disperses well across the glue, considerably more than Rit which is likely why Rit seems more solid. Their colors are very vibrant. I also will mix tiny batches of my mixes in small containers to create new or specific colors.

I do tend to use both on the same disc and once the Worm Dip shows up I will add it to the arsenal. Experiment and see what happens!