Editor's note: This article has been reviewed and updated for accuracy in 2026. The earliest known use of hash traces back to Persia around 1000 to 1200AD. Surprisingly, it was assassins that brought the extract to fame. Some scholars actually state hashish translates to assassin in the Persian language. Marco Polo took the fabled tales of assassins and their hash use back to Europe, and nearly a thousand years later, you can pick up some high-quality hashish in dozens of European and American destinations. When most of us think about hash, we imagine the pressed black blocks featuring a gold seal, freshly smuggled from lands like Morocco, Nepal, and Afghanistan. If your last crop had a decent yield, you can skip the illegal importing and attempt to make it home yourself. This guide looks at how to make hash using two of the most popular methods – Dry ice and bubble extraction. What Is Hash? Hash is a concentrated form of the trichomes found on the cannabis plant. Trichomes are the tiny crystal-like formations found on the calyxes (resin glands), leaves, and buds. You'll know it's time to harvest when 60% or more of the trichomes look milky under a microscope. While everyone enjoys toking on some high-grade, well-cured flowers, extracts are fast becomi