It is possible to make signs dyed with any color dye glow, but if a sign is only colored using the § symbol and corresponding codes, neither ink sac does anything. If a sign is bolded/italicized using § codes, dye can be used to color it, then it can be glow-ified.

It should also be noted that a normal ink sac will not darken an already glowing sign made pre-1.16.220.

This is an issue for mapmakers & builders using multicolored signs as they are still illegible.

After some further testing:

• if dye is used on a sign w/ formatting codes, any black text not explicitly coded will change color and it will be possible to glow-ify the sign
• this seems to be because ink sacs will not do anything to signs that the game thinks are black

What should happen:

• It should be possible to glow-ify colored signs regardless of the method used to color them
• The colored sections of signs should glow even if there is uncolored text on the sign

What actually happens:

• Only signs colored with any dye can have a glow ink sac used on them, making multi-color signs difficult/usually illegible.