Germinating Shiso - what am I missing?

Triffid

Garden Ornament
Joined
Jun 22, 2021
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Location
Southern England 50.8°N
First of all my seed is 1 year old, but not past its use-by date. Not fresh enough?

I've tried twice now with soaking it overnight, keeping in a paper towel, full light, warmth, but to no avail. What am I doing wrong?
 
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