Hi Edward ! The chemical composition of reduced black oxide is mainly metalic copper i.e. Cu $B!# (J. Regards, Motoyo Wajima General Purpose Computer Division,Hitachi Ltd.(Japan) "Eltek Ltd. - Process Engineering" <[log in to unmask]> $B$5$s$O=q$-$^ (J $B$7$?!' (J >Hi Technetters ! >Some time ago I tried to test electrical conductivity of the reduced black >oxide : I placed a piece of conducting rubber on reduced black oxide area >and measured conductivity between this area and the upper part of the rubber >.The innerlayer was rinsed in DI water and dryied at 95 centigrade to take >away any moisture . The purpose of the rubber was to avoid scraches on >black oxide . I was suprised , but it was conducting . >Does anyone has explaination what is the mechanism ? I would expect , that >dry crystals of cupric and cuprous oxide should not conduct . One of my >friends told me , that one of crystal form of cuprous oxide is conducting . >Best regards >Edward Szpruch >Eltek Ltd - Israel >Tel 972 3 9395050 >Fax 972 3 9309581 >E-mail : [log in to unmask] > >############################################################## >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. >For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 >############################################################## > *********************************************** Motoyo Wajima General Purpose Computer Division,Hitachi,Ltd. 1 Horiyamashita Hadano-shi,Kanagawa-ken,259-13 Japan E-mail:[log in to unmask] Fax:+81-463-88-2935 *********************************************** ############################################################## 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. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################