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The Black Mirror Hints
Where can I get a boron oxidant label?
1 of 5: Try looking around Richard's lab.
2 of 5: You won't find any new bottles in the lab...
3 of 5: ...Richard said that the bottle of boron oxidant that he dropped was his last one.
4 of 5: Maybe you can make good use of the remains of the broken bottle.
5 of 5: Look at the shards on the floor next to his feet to find the one with the label on it.