You can colour cyano glue, we make a rage of colours to order ( but only batch quantities), yellow, brown, red, purple, brown, black, green, white , dayglow pink ,yellow and orange are colours we do regularly
We do as standard stock product (sold as the StarLoc industrial brand) a dayglow pink cyano (the other colours are made to order in batches of 1000 bottles minimum (we are thinking about doing a range as standard stock, but not sure wether to or not yet))
You can't add anything like food dye to CA , so dont waste the CA trying! ,
If you realy want to try it...... wear goggles......
take the top off the bottle and tip some food dye in......, quickly put the cap on and shake......(needs the cap on, it explodes beter!)
STAND BACK! (disclaimer, i dont expect anyone to try this, its not my fault if you do, i am not liable for damages if you zap.... yourself with hot CA )
It is very, very difficult to get a dye compatible with CA and then the CA needs different fomulation for use with the dye as well
In general the only other colour used as standard product is blue, however the blue dye lowers the strength of the CA , allowing it to be used as a temporary seal, making it not much use for structural applications
Even if you find a dye that seems compatible, it will set the CA off rapidly, unless the CA is manufactured to be used as a coloured grade
You are better to do what woodturners do, use a coloured dust and run thin CA to make it set in place, works with plastics ,woods etc