What Are These Blue Crystals At The Bottom Of My Bath?

What Are These Blue Crystals At The Bottom Of My Bath?

Copper electroforming solution is made with a blue crystal called copper sulfate, among other ingredients such as sulfuric acid and brightener if you use the Midas Bright from Rio Grande. As you use your solution the other ingredients start to dry up when you don't replenish your solution with distilled water.

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