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When it comes to solventless extraction, every detail matters, from your starting material to your press temperature. But one of the most overlooked factors in producing clean, high-quality rosin is the micron size of your rosin bag. If you’ve ever wondered what those numbers mean — 25, 37, 90 — this guide breaks it all down so you can choose the right micron for your next press and get the best balance of purity, flavour, and yield. What Is a Micron? A micron is short for &ldq …