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a-PVP powder is crystallized in a solvent with 1g per 0.5-1 ml proportion. The solvent solution is prepared from water and alcohol in the 30/70, 50/50 or 70/30 ratio. It is very important to use well-purified a-PVP powder. A dirty product can make crystallization difficult. The solution is boiled and poured into container with dissolved a-PVP. The thicker the solution layer in the crystallization dish, the larger final crystals size. a-PVP crystals have to grow under constant conditions. The procedure is very sensitive to temperature and humidity changes. It takes to use a room with dry air (relative humidity <40 %) and a constant ambient air temperature of 20-22 ºC.

Large a-PVP crystals amount is formed in solution, when ~50% of solvent is evaporated. A gradual cooling is applied in order to increase crystallization speed. The temperature should be decreased for 2 ºC every one hour (from +20 ºC to -20 ºC). There is way without gradual cooling. The crystallization dish is placed into a refrigerator at 4 ºC for 8-12 h, then it is placed into a freezer -20 ºC for 8-12 h in accordance with conditions.

The obtained a-PVP wet crystals are dried in a vacuum
desiccator or with help of infrared radiation (IR lamp or IR heater).
Product 959392a4e62462454561e96198e266bc

a-PVP crystals can be dyed well with food coloring. a-PVP is dissolved, a small amount of food coloring is added to a solution of water and alcohol. It is important not add too much food coloring in order to not spoil crystals appearance.
Product 98efb32ec0f5a7d5174c78531b44e45c
573dfacd7dc67c675c38fbefe1cd0b97
 
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pachemguy

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Was not really planing on dyeing these crystals but now you got me thinking they look really nice
 

SonicNL

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Hey, does colouring with food colour works for cathithones too?
 
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