Re: Starting the HARD way.
I have no experience in type III, but I can offer this:
7xxx alloy will anodize much quicker than 6xxx. I think you have gone past desolution with the 7xxx alloy. I typically run 2xxx and 7xxx for only 3/4 of the time need for the same color depth of 5xxx and 6xxx.
Isn't type III usually performed at much higher densities? 4hrs is a long time to be in the bath. I would have thought something like 24A/sq. ft. for 1 hr. It sounds like your cooling system will certainly handle it.
Obviously, with higher CD's, you will have more gasses to deal with, so good ventilation will be needed.
You're probably going to have to do quite a bit of experimentation before settling on a formula that works good with your apparatus.
BTW, what was the measurable build?
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Specializing in anodized graphics in Paintball guns.
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