For the details, the rules, the winner selection and the prize, go to the original/Day 1 contest post. The forms for Days 1, 2, 3, 4, and 5 are now closed, so please do not enter any answers there, as they will be disqualified anyway.
I would highly recommend that you read everything in the Day 1 post if you haven't already, before submitting an answer.
This photo was taken under artificial lighting.
Day 6 Clue: The name of the colour is in the name of the colour.
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