Hello Technetters:

    Recently we are having a problem on our black oxide layer color. 
After pressing (especially for 4 or 6 layer board with thin outer
prepreg, e.g. 2116 single ply), the black oxide around the edge of some
boards seemed to turned red.  This caused particularly low yield
recently.  

    Can anyone knidly give some advice, or have some experience on such
issue?


Darik Leung
Mica-AVA (F.E.) Ind. Ltd. /
Oriental Printed Circuits Ltd. (HK)
Quality Assurance
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