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OSP gets darker after sencond reflow

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#76831

OSP gets darker after sencond reflow | 4 January, 2017

Good day,

Having recieved new batch of PCBs with OSP surface finish, I have noticed that some polygons not covered by solder mask and solder paste become darker after second reflow cycle compared to PCBs not being sent to reflow.

I wonder whether it is acceptable by IPC? What could be the reason of such color change?

Any input is appreciated. Thank you in advance.

Best Regards, Pavel Murtishev

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