Removing epoxy packaging from chips

source : https://www.youtube.com/watch?v=mT1FStxAVz4&list=WL&index=1

1. Using machine remove the top packet
2. In Room temperature put a drop or two of fuming nitric acid into the milled packet and waited for a while
3. Put the IC on the hot plate, like ceramic container. Around 100 degree C for speed up reaction.
4. keep put a drop acid on the ICs top when acid evaporation.
5. Use Acetone clean the Chips.