Maybe you can try it further out with those tiles, put the other side also in the sunlight.
23 sets, that's well 1656 tiles Well done, hope the tournament will get awesome.
Looking at that original image I would have thought the "good" green was the bit of the tile that hadn't been exposed to sunlight, and the bit that was bluer had been bleached by the sun - just like a lot of the spines of books on my bookshelf that have caught the (lower angled) winter sun over the many years they've been sitting there! But certainly worth experimenting with - any idea how long they might have been left?
I think wolnic is right: I compared my original GC tiles and they have "good" green, which is on half of two tiles. Of course, I could still do an experiment and make them at least all the same, but it will be "bad" green. Good project for my son, actually And - I have no idea how long they have been left on sunlight.
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