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Formulation of stencil etching chemical for surgical instruments

Q. Dear sir,
As we are making etching stencil which is working successfully in Sialkot Pakistan.As well as we are making etching chemical in which we are facing this problem that when we apply stamp it looks sharp and jet black and clean it with cleaner but after half an hour it becomes brown and get bold. Now we want the best solution from your side. If you have any better formulation regarding this please share with us.
Waiting for your reply.
Thanks

Sh. M. Imtiaz Imtiaz
product designer - Sialkot, Pakistan
January 15, 2010

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January 22, 2010

Q. Dear sir

We are making a type of chemical in which we are using such type of things.

30 %  : H2NO4

1 LTR :water

10 % :glycerine

5 %   :Sodium bichromate

We know our methodology is wrong and it is just a tip which is working but not properly..

PROCESS : We are already told you that we are doing etching on surgical instruments. Definitely you've seen stamps on surgical instruments e.g. Scissors, tweezers, etc. We etch in 1 or 2 sec of 24 volt. The most famous chemical is SHELLING. It's called ELECTRO ETCHING in simple language.

CLEANER:

We make cleaner by mixing:

Soap

Shampoo

Kindly help us in finding /making better formulation.

Thanks

Sh. M. Imtiaz Imtiaz
product designer - Sialkot, Pakistan

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May 27, 2011

Dear Sir,
I have already sent you mail of detailed chemical formulation of etching so that you may help us with a better formula but still are awaiting response. We are searching for better formula of it since 5 years. Kindly reply to us as soon as possible.
Waiting for your reply anxiously.
Thank you

Sh. M. Imtiaz Imtiaz
product designer - Sialkot, Pakistan

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