Will.MadeleyIf it is the same Grey/Blue keycaps set Ducky did for some time ago, I can tell you that the grey keycaps don't let the backlight/LEDs shine through. The Blue caps shows a little little light/only glows.
The test picture: A ISO/Nordic layout white Ducky Shine 2 k-board with white LEDs.
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My Ducky ISO/Nordic PBT Laser Engraved keycaps set.