Instructables

PCB Etching Solution - Cupric Chloride

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Step 11: Finalize Mixture

Picture of Finalize Mixture
09B - Filter & Hydrogen Peroxide.jpg
09C - Ready.jpg
1.Recombine the electrolyte and oxidized copper, the solution will turn dark green-black.

In 15 minute increments:

1. Add 1/2 tsp. fulls of hydrogen peroxide (3% - general purpose type).
2. Stir the mixture with a plastic utensile (straw).

When the mixture is light green:

1. Filter it.
2. Store it.

In use, the mixture will become dark-black, recharge it by adding hydrogen peroxide.
 
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