i might need some help, ideas and opinoins here.
i would like to know if anyone know how eliminate or reduce discoloration of copper leadframe. The problem is now the the discoloration appear only after spot plating process. the figure shows sometimes like black dot, sometimes like chemical splash on the surface of the leadframe. i suspected it is genaration of platina and if it was... how to control it. Silica gel might not really helpful currently.