freezer will just make the keif harder to press room temp works but u can put it ina heat proof bag boil it for a min or so not too long so it dont get real hot then take it out and screw it tighter it will screw alot tighter..then put it in freezer to get it cold cuz it will be sticky most likely and pop yer peice of hash out. dont worry if its black or brown because thats just a combination of melted trichomes and oxidation. and remember pressure = heat so yeah have fun and smoke a peice of yer hash for me