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If your having issues with yellow chromate adhering add an ounce or two of sulfuric acid per 2 gallons of solution.
Blue chromate is just sodium dichromate with nitric acid instead of sulfuric.
When you pull part from electrolyte you need to rinse in a mild 5% hydrochloric solution before dipping in yellow chromate and after you pull it out of yellow chromate you need to dip rinse in just distilled water then hang to dry. If you don't rinse after yellow chromate it will come out dark and uneven with runs.
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