I know of a bloke that ground up luminescent chalk and added it to his flour blaze. Not too sure if it worked well for him or not and overall flour blaze is not going to last in the rain.
Here is a bit of research into the luminescent thing
https://www.traps.co.nz/Content/Imag...e%20report.pdf
My feeling is the possum sees the flour first from a ways off, goes over to take a look and the sugar/cinnamon/curry/scent keeps him there until he stand on the trap.
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