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Substitute manganese carbonate for the manganese dioxide for a better result.
Buy the phos. acid at a hydroponics suppy shop (ph down)and the manganese carbonate at pottery supply shop.
If you try to buy it from a chemical supply shop it will cost you small fortune.
You can try to use cerakote instead of parkerizing.
To proper parkerize you nead some equipment like an sand blaster and a proper place to use the chemicals. The cerakote is much easier to apply and comes in different colours.