I am currently looking for some red on black pbt keycaps. If someone knows where to buy some that would be great.
Thanks
If it's PBT it would be dyesub and which you can't dye sublimate a lighter colour onto a darker one and the text will likely not show up, if it does it definitely won't be red.
SP can do PBT double shots now but nothing in terms of sets, so sadly at this time you won't be able to find this set you want.
ABS on the other hand that's possible and has been done with 2 different sets already so far.