Photon
Member
As said by others surface solvents are easy to remove via vacuum and mild heat. But solvent/impurities can and will get trapped in the lattice and amorphous regions if crystals rapid form. This is why we are recrystallizing in the first place. Its the shit that gets trapped behind from yield being more important than quality. Just did recryst on some of the shit TC from AASraw I just got. Off to Jano Monday with before and after samples. MP is good at 101.2 initial and 102 clear. Nice sharp MP. Happy with the result on it. Just ethanol as solvent and carbon wash/filter through celite and slow cool from 60c. Seeded at 40c. MP video starts at 101c 1c/min rate. Out of the bag MP was 90c initial and 100c clear. So both depressed and extended. Powder looked fairly white(light beige)but was yellow as piss once in BB, would not go into dissolution. I ran it up to 250mg/ml in straight BB and up to 150c.
Were you able to figure out where the yellowing came from?
