An alternative to electroplating! Simple practical inventions

An alternative to electroplating! Simple practical inventions
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0:00 The use of detergent, an alternative to electroplating.
0:45 Treatment of the knife with alcohol and a detergent based on nitric acid.
1:55 Washing the knife in water after blackening.
2:33 An experiment with a carbon-free instrument, a test for a protective coating.
4:05 Lightening of the old zinc coating.
5:35 Carob key treatment with nitric acid, from detergent.
6:25 Fixing the result of blackening the metal, using oil and heating.
7:10 Obtaining a stable, protective coating on metal.

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