Etching with Ammonium persulphate

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Joined: 31/10/2011
Location: Australia
Posts: 346
Posted: 12:20am 31 Dec 2021      

The Ammonium Persulphate bottle I bought from JayCar states that you dissolve 1 part of AS in 5 parts water.
But it does not give any info about how much AS is needed per square cm of copper.
Obviously, you need more for a larger PCB than a small one.
Does anyone know? Any assistance will be appreciated.  Happy New Year to all.