Marc, will some Hatt off-white work? It is the same color as Parker off-white.
Give me a call. 727.452.0031 We have plenty of liquid gel pigments that we can send you for free. Too bad nobody uses old film containers, as that would be the easiest way to send you some yellow and black. It may be easier to send you some brown and yellow, as black is hard to work with in pigment form. A pinhead of black pigment will turn the gel grey very quickly, and it takes a lot to reverse.