Yasmeen, Assuming you need to look at the structure, and dont want to fully remove the Sn-Pb, I have used the following as a general etchant in the past with good results. Use a swab to get a more even etching, or take care in a petri dish 10ml Acetic acid, mix with 80ml Glycerol and then add 10ml of Nitric acid etch time 2-10s depending on how far you want to etch into the structure and what you are looking for. Lead will be darkened alternativley, use 5g of silver nitrate in 95ml of DI water if you want a high contrast Good luck Roger Motorola AIEG ______________________________ Reply Separator _________________________________ Subject: [TN] Etchant for SnPb solder Author: "TechNet E-Mail Forum." <[log in to unmask]> at #email Date: 19/08/99 09:07 Hello Everyone! What is a good etchant for SnPb (60/40) Solder? Thanks, Yasmeen ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ############################################################## ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################