Etch Optimized FPL Process

Remove ink markings and stamped identification by wiping wifli commercial solvents, such as acetone, methyl ethyl ketone (MEK), lacquer fliinner, and naphflia 

Caution should be taken in making the solution. Add the acid to 60% of the water, stir in the dichromate, and then add the rest of the water. Never add the water to concentrated acid  

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