Hi everyone Recently I met with a range of different technicians from a variety of establishments. One tip from a German company was that during the dying process they put it in a vac chamber, this draws the dye deeper into the part. Since i don't have a vac chamber to hand i cant test this. But if any ones does, could they please post.
How much of a vacuum is needed? Here's an Instructable for a DIY garden water hose powered vacuum chamber.
Really not sure. Regrettably id had a few drinks by that point and didnt question him further on the process. I'm going to suggest it when I visit another university next week. See if i can give them a model and some dye, then let them have a test. I presume they would have a way of agitating the dye while in the vac-chamber or perform a series of vacuuming and agitating separately.