ok well if you really wanna know go down to radio shack and pick up a 10x pocket micro and look at the tricroms ( thc glands ) i like mine to be almost a nice amber not all amber but 3/4 of the way and thats when its harvast time make sure to hang the plant up in a dark room thats dry and leave it alone for a week then put it into mason jars for at least another week and bam u got some killer medication