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How to get fluffy crystals ?

Migrated topic.

watermelon555

Rising Star
Hello everyone,

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

Like fluffy and powder very dry : 2 hosted at ImgBB
or Like beautiful crystals : 1 hosted at ImgBB
And also yellowed with trapped Solvant inside : 3 hosted at ImgBB

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 :)
 
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