The trick is to realize this is anodization, not cathodization. Chemically, this is the sodium salt of sulphuric acid, and you can dispose of it safely after neutralizing it with baking soda.
When they react water and a salt called sodium nitrate is produced ... Nitric becomes nitrate, hydrochloric acid becomes a chloride and sulphuric acid becomes a sulphate. Katie: Oh go on then.
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