There is an Old formula utilizing Iodine and Potassium Iodide. in Water. I believe it was 10-20 g/l I with similar amount of KI , run at about 140-160 F this is from memory , I have the formula in my office , I will return there Monday , I will post the exact formula then. Russ ---------- From: Andi Petculescu To: [log in to unmask] Subject: [TN] Gold mask etchant Date: Wednesday, November 25, 1998 11:36AM Hello, I am looking for a suitable etchant for Au films deposited on Ni, which DOES NOT affect the Ni (i.e other than aqua regia). Could anybody help me? Thank you! ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################