I was under the impression that alkane solvents weren’t great at pulling chlorophyll. 
i wonder if he maybe has some ethanol in his hexane maybe some lle on ethanol crude that wasn’t purged
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Chlorophyll is incredibly non polar. “Like dissolves like”.
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This is VERY possible, he could have had water or methanol in there that pulled a little chloraphyll.
This is why I use heptane and methanol for LLE with no water!!! Unless you use sieve beads you’ll never get the water completely out
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The bidons had some ice forming on the outside standing in the ultra freezer for 3 days
Possibly some fell in
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