"Nickel structure observation"

Question:

"We would like to observe the microstructure of a Nickel coating. Do you know a chemical solution revealing the Ni structure for microscopic observation?"

Answer:

Try Glyceregia (10 ml HNO3, 20 ml HCL, 30-40 ml glycerol) or 1 part HNO3, 1 part glacial acetic acid.

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