Hello everyone,

I would like to understand why my crystals are like this after a crystalisation or Rex :

Like fluffy and powder very dry : https://ibb.co/mFwKFRt
or Like beautiful crystals : https://ibb.co/gSvTqs3
And also yellowed with trapped Solvant inside : https://ibb.co/419Hxv6

I would like to understand how to get always Fluffy crystal everytime as the first picture, I'am using Cyb's AB teks for more than 2 years with a hot plate magnetic stirer.

Is my plate is too hot ? What are the conditions to get always fluffy ones ? I tried slow evap / freeze / fridge... I don't understand, it looks like a lottery to me but there is something I don't know

In tried with Naptha and also Heptane with same result.


Thank you in advance for you advices