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Number printing on steel by chemical etching

Which chemical to be used for printing a number on Hardened Steel surface? The color of print required is WHITE.

DEEPAK GUPTA
speciality moulds - Gurgaon, Haryana, India

Ferric Chloride
ferric_chloride

Dear SIR:

Steel is etched by making it as a anode in a solution of acidified {ferric chloride ⇦ on eBay or Amazon [affil link] } and the cathode will be lead with external D.C current. If you wish the color of the print to be to be white so the background have to be black many kinds of finish will give you the black color like

1-black nickel
2-black chrome
3-oxidizing of steel with black oxide .....e .t.c

Thanks and best regards,

RAAFAT ALBENDARY
National Plastics Electroplating - Cairo, Egypt

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