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Lack of depth in deep etching stainless steel and aluminum

I am fairly new at the deep etching process on stainless steel, as well as aluminum. I have been using ferric chloride ⇦ on eBay or Amazon [affil link] , at different strengths for both materials. However, I am finding that it takes up to 45 minutes+ to achieve any sort of reasonable depth. Can anyone advise me what formula to use to speed up the process?

Jim Graham
Panda Signs - Boksburg, Gauteng, Republic of South Africa
2003

We need to buy a deep etch marking system to mark on dental and surgical instruments. how deep we can get thru. is it possible to make deep etching such as on steel rules. I appreciate your reply. Sincerely,

John Bajwa
- Harrar, Wazirabad Roadm, Sialkot Pakistan
2003

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