As you can see in the picture the parts of the plant above the first true leaves are really healthy, but under that it don't look good....seems like the rest of the plant is acting like those were the seed leaves(little round leaves) lol
Your 10 day old seedling has my 2 week one trumped. Looks green and healthy with some tight nodes. Maybe the leaves are a little twisted but nothing I would worry about.
Its TGA subcool Chernobyl.. I compared some of his seeds to other companies.. subcools seeds look super healthy, only way I can explain is it is organic looking. I focused on waiting until the soil almost dried out for the next waterings.
I've had purple on young seedlings mate, and it clears as they got a little older. Caused me no problems whatsoever. On the other hand you may have a purple phenotype there, either way, i wouldn't be concerned about it. Your plant looks fine.
the purple under the leaves may be due to cold weather... but then again you may have yourself a strain that thrives in it. That seedling looked pretty promising for only 10 days young.