claim that it is in their interest to GIVE you the old dyes (moulds) for free
When I was a kid, a friends parents owned a glass company. As I understand it, when they were done with a mold, it cost them money to dispose of it and if someone asked them for it, they would give it to them with the stipulation that any boat that came out of the mold would need to have a badge stating the designers name on it.