I have done some very light experimenting with dying. While the plastic being used was most likely not PBT it might be useful. Adding salt helps penetrate the plastic a bit. Acetone has a stronger affect (albeit more dangerous as it can melt/warp plastic). I tried to keep on a medium to low/medium and not go to boiling. I would like to get back to it but the odor was strong and the experiment was not appreciated by all in the household.
