Sorry for the small size (cut out of a larger pic) but this pic is of a Dr Decal & Mr Hyde A4 white backing laser decal sheet, after running through my Fuji Xerox Docuprint CP225W colour laser printer. This allows me to produce decals featuring white or that will go over dark background colours, as standard clear laser decals are as transparent as all get out!
https://ibb.co/5FZRKYhI surround difficult-to-trim shapes with the intended underlying colour, ie Gloss Sea Blue for an early A-1 Skyraider, so that I only have to cut out a simple square. Even roundels are difficult to trim with no white showing! I'm only onto my 4th set of these, as opposed to my 52nd clear sheet, as I don't need as many of them usually.
Done via RGB colours so fraught with danger, ie the paint I actually use may NOT match what my printer interprets the RGB as when printing (and RGB figures found online will often vary markedly between each other and how the colour actually looks!), and they are MUCH harder to print and seal than standard clear decal sheets. On this one you can see "ghosting" bottom right, where images have smeared and repeated down the sheet. This was my 4th attempt at printing this sheet, done first thing in the morning with a cold printer, the previous 4 were even worse! Bottom right (below 1/48 816 Sqn FAA S2E Tracker tiger faces, with Gloss Gull Grey backing) are Dull Red codes for a Stirling IV ("MA-Y/LK236" of 161 Sqn -
http://www.grahamhague.com/pottonstirling2.shtml) with Night backing, total fail! Conversley the image top left is a 1/400 flight deck for Heller's Duguay-Trouin (D611) and I couldn't be happier! But unlike my clear stuff I am yet to actually use any of these, so more problems may emerge, ie white edges showing after trimming etc.
So not the be all and end all, far from it, but even my 4 ruined sheets were FAR less than $6k! ;0