@Keith Gandy
I checked the JD dye MSDS and it is Dow Chemical Automate Red IK HF. Some Googling led me to this info:
AUTOMATE RED IKHF is a single phase, liquid concentrated solvent soluble dye containing C.I. Solvent Red 164 and provided in a high flash, aromatic solvent system. The solvent is used in the product as a viscosity depressant and standardizing agent.
The product has been found to be completely miscible in all petroleum fuels, lubricating oils and many other related hydrocarbon solvents, including grease and hydraulic oils. Common applications include the coloration of lubricants such as Automatic Transmission fluids and 2 cycle oils. It has also found use in a variety of other applications including the coloration of fuels, solvents, polishes, fertilizers, explosives, adhesives and for leak detection. It can be mixed with other colors in the AUTOMATE product line to create a limitless number of shades.