Working with disperse dyes is fun. Just make sure you make them up using the manufacturers directions as they can sensitize some people. When working with students I always make them up myself prior to the class and ALWAYS use a mask when doing this. I only buy 50g amounts of the 3 primary colours, red, blue and yellow and then mix the other colours myself. I have used about 20g of each colour with over 200 students. Granted, we have only made small pieces but even so it goes a long way. Each of those students would have painted an average of 3 A4 pieces of paper each, that is over a whole packet of photocopy paper.