Hello,

Could anyone help me to solve the problem of wet etching Cr/Cu?  The copper is
on top of the chrome.

I have a hard time protecting the copper when etching the chrome.

For chrome etchants, I've tried 1020 AC from the Transene, and CR-4.

The pattern is 40 microns in width, and Cr/Cu is 100 A/ 1 um.  The undercut is
severe.

Any suggestions will be greatly appreciated.



Regards,

Jai
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