Why is my yeast freezing weird?

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Jiggoloh

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Hello everyone!

I'm new to yeast banking and for the first time I tried freezing yeast. I made a starter, used sterilized equipment and 25% glycol solution. I did not freez in alcohol, though. I used a thermobag and freezing took more than 4 days. Yet one of the vials froze in some weird crystal shape and the other three actually separated the yeast from the water. Can anyone help if I can improve for the next time?

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