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Does this mean that dissolution begins before PAR and once PAR is accomplished the piece being anodized is complete?
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Dissolution begins immediately, and if it didn't you would not be able to grow the columnar pore structure anodizing depends on. When dissolution becomes excessive the trouble starts.
Don't worry about PAR, I was wrong when I wrote that in assuming that everyone would have the level of instrumentation that I have. A pretty dumb assumption now that I think about it.
Use the 720 Rule.