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I have been repairing cell phones for over twenty years, during this time I have accumulated a huge number of devices, most of which are no longer liquid, I can't bring myself to throw them away, Avito won't take them, so I practice on the material that is available in abundance. I am not very strong in chemistry, I got a C in chemistry at school, but a sudden interest in the topic of refining pushed me to gain new knowledge. The topic of refining has become interesting to me, I treat it as a hobby and not as a means of earning money, so be more restrained in the comments. If I had material from the councils, I would prefer it without hesitation, but I don't see the point in buying material at the moment - I recycle my own - free.