Here's a method of turning crank to ice.
Approx. 10g of product is wieghed out. Then approx. 5.5 g of water is added to this and the product is allowed to dissolve as much as possible. Only about half will dissolve the rest will just settle do to saturation of the water.
The beaker is then heated under low flame and brought to boil. Once the product completley dissolves and the water condenses a little you will notice a thin clear cap of crystal formation when the beaker has air blown into it. If a thermometer is placed in the water it will read 104 C this is also a way of knowing when to remove beaker from the heat source. Practice will give you the ability to just see the water and know when to do what. Once removed from the flame the beaker is covered and placed somewhere. NOT TO BE TOUCHED OR MOVED AT ALL. Moving the water while the crystals forms causes them to break resulting in small crystals if that. Well now that the water has completely cooled and the crystals finished forming in the overconcentrated water a toothpick is used to puncture the surface. This is done to be able to pour off the excess water from the beaker. This water is collected in the dish that it is poured into and allowed to evaporate to collect the meth that is dissolved in the water. Next is an acetone rinse after draining the water. Just add a little and lighty swirl around and pour off into the water that was drained off before. Then the crystals are passed onto the glass plate and fan dried. Using more product results in more volume thus more space for the crystals to grow.
The reason you use a thermometer to check temp at 104 Cis because water boils at 100 C but having meth in the water changes that boiling point. At 104 C the concentration is good for recrystalization. There is another point to this though. You see the more concentrated your water is under heat the more crystals you'll get out when you cool the water down but they will also be smaller. If the over saturation is not that much then you'll get less formation but also larger ice shards. If you leave the ice in the water and dont pour it out but only make holes for respiration after about 6 months the water will have evaportaed leaving thick ass dense completely tansparent ice shards.
Do not throw away the water you pour from the beaker, it is very valuable as it contains whatever product didn't crystalize. Remember its about oversaturation so only whatever doesn't fit in the cooled down water will come out as crystals. The rest is still dissolved in the water. This water can be allowed to evaporate to collect the rest of your product.
Here's the reason to use a tall thin glass to crystalize instead of a short fat one. This is because the crystals grow down from the cap it makes. Gravity plays a role in this one. Since the crystals are suspended in water they are constantly falling so as they grow and become heavier the crystal grows out in the direction of its movement. Down. Hence long transparent shards. Crystals also grow to hottest spot in the the vessel. (the center).
100 g use 55ml water
1000 g use 550 ml water
Dont mess with the formula too much. If the meth is a little more concentrated in the water, it causes more output of crystals but smaller.