Microns are the size of the screen that the trichome passed through in the extraction process.. examples..25u, 45u, 73u, 90u, 120u, 220u. The smaller the # the finer the size of the glands.. That does not necessarily mean that's where you find the best hash. It is dependent on strain, I find that the best hash is usually between 73-120 microns.. Good hash should melt almost completely and will have clear domes at the peak of the bubbles.

I believe you are speaking of the size of the trichomes on your flowers, which usually aren't referred to in microns, but rather a hooked stalk trich or a bulbous straight trich.. Indicas will generally have larger trichomes than Sativas.. Hooked stalked trichs are more common in Sativas.. However there will be combination's of both in some hybrids.. Also be aware that trichome coverage doesn't necessarily indicate potency either ( although it's usually a good bench mark indicator)..There are many books written on the subject of cannabis. I would suggest works by Mel Frank, Robert Clarke, Dj Short, Greg Green, the list can go on and on.. Robert Clarke's Book on Marijuana Botany is a great read, as is Cultivating Exceptional Cannabis by Dj short..Both pretty detailed for the beginner but must reads.. On the subject of hash I suggest reading anything bubbleman has posted on the subject as well as sub cool.. Robert Clark also has a great book on hash called Hashish great read if you're into concentrated forms of cannabis..:rastasmoke: