I also use these and found another way for mixing. When I find a color I like, I premix a small amount into a 1 oz plastic bottle (like the ones FO's come in). Because I just use these for swirl color, I use a pipette and mark down the number of drops used. I had trouble trying to figure out teaspoons per batch, so found this was much easier for my mathicatically challanged brain...LOL