What I believe is that if you have a grey background with white lines on it as a digital image, you should be able to print this on white decal paper. The print will be grey where the image is grey and nothing will be printed where the image is white.
When the decal is applied the white lines of the digital image will be white because the decal paper is white. The grey will be grey.
If anyone has tried this perhaps they can confirm if this is either viable or actually works where white is needed on the decal.
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