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what are the ingredients of invisible marking ink for hardened steel and ferrous parts ?

the marking is permanant and is done using toothpick on ferrous parts.

2006-07-13 04:37:23 · 1 answers · asked by pradeep k 1 in Science & Mathematics ➔ Chemistry

1 answers

HCl (Hydrochloric Acid)

2006-07-13 05:22:04 · answer #1 · answered by ag_iitkgp 7 · 0⤊ 0⤋

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