Cinnamon infusion, second filter. It's very dark, quite concentrated, it's not as sludgy as it looks. - i hope. Cinnamon powder wrapped in a coffee filter, infused for 3+ weeks, drained, then another parcel of cinnamon powder, for 4 days. i need to get lab filters, soon. As fine as possible, that will pass PG.
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I suggest you obtain some Wattman filter papers from your local laboratory supply store; a Wattman #2 (2um) and you will only need to filter once.