[MW:28375] Copper Sulphate test

Dear Experts,

We have an SS 316 Lateral Joint project going on here. Client request for a verification of Pickling and Passivation (i.e) purity of iron. We have recommended Ferrite test, but there is also a copper sulphate test as per ASTM A380-06. Kindly confirm which is the best and easy way to sort out.

Br

Dhana

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