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Suggest best procedure for blackening surgical needles

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Please suggest the best method of blackening surgical needles that will be non corrosive , non toxic & medically acceptable.

We manufacture stainless steel surgical needles that are usually electropolished for a bright finish.We now require to blacken them. Can you suggest a simple method to blacken these needles. The blackening needs to be non toxic, non corrosive and medically acceptable.

Prym Raman
Surgical needles - Coonor, Tamil Nadu, South India

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If you are not working to a specification, I hope that your product never gets to the USA.

James Watts
- Navarre, Florida

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