Aluminum Etching for visualizing welding without HF Acid

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Neel_2910
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Does anyone know of an etching solution suitable for aluminium and its alloys that does not contain hydrofluoric acid?
 
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A large amount of information on this subject is available online .

Just search on ' etchants for aluminium ' .

Note that some of the etchants recommended for Aluminium pure metal don't always work properly on Aluminium alloys .