Quoted:For baffles no reason to mess with colored dyes.
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Except it will help you see if you actually created an anodic layer, and about how thick with mild destructive testing. Useful when you have few controls and little experience.
A ~15-20% sulphuric acid bath (auto parts store battery acid is not pure, so you'll be more like 2 parts water to 1 part battery acid), kept below 75°F if possible, and a power supply that will maintain around 20V will give good results. 12V will work, but that's not enough "pressure" for a thicker anodic layer like you're for wanting durability. Lead or aluminum cathode amounting to about 1/3 the surface area of the anode parts. Time varies based on current; best bet is to actually watch the parts. They'll turn a darker flat grey. What you
don't want is any kind of pitting or yellowish-brown tint; if that happens, you're over-anodized (burnt). If the acid concentration is too high, bath temp too high, amperage too high or cathode too large, you'll burn parts pretty easily.
Home anodizing is basically all gonna be type II. Type III "hard coat" requires far more control of the process than most home anodizers would have the budget or inclination to deal with. And type III really won't take dye, cells are too small.
ETA: You'll definitely want to do a few test pieces of the same alloy before attacking your baffles/caps/tube.
Now titanium anodizing is a whole other animal, and it does nothing for durability; strictly cosmetic. You can also flame anodize Ti, just watch that you don't distort your tube.