UIC GSM and NiPdAu pads

We have a problem with QFN IC's with NiPdAu plated pads. Our ULC's don't see the pads due to the almost ideal reflection. Vision sees the pads almost black. As we don't have OAL-cameras (which can help in this case, I assume), I am thinking of back-lit nozzles, as QFN's have pretty good defined case outline and then center using MELF algorithm...?

- Deni

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