No built in dye. There may be products that do that. The Ester oil that BG produces for retrofits has the dye in it.
The dye is part of the oil so one must be installing oil in order to introduce dye into a system. They used to make small cans that contained oil and refrigerant to install oil. The same could be done with the dye. But cans of R12 or R134a are required to be of a certain purity and that doesn't include dye or oil.
Bosch Master, ASE Master, L1
33 years MB technician