I mix my own as well and, to date, the formula I've settled on is a 50/50 mix of Model Master Enamels Olive Drab FS34087 and faded Olive Drab SKU 20510. I also add about 50% of their Schokoladenbraun RAL 8017 for PC12. I'm using Tamiya Acrylics much more for airbrushing of late and have a note to try a 50/50 mix of XF-51 Khaki Drab and XF-62 Olive Drab but have not tried it to date. I vary the former by changing the ratios with more or less of the faded version and thus the Brit Subjects I have all vary a bit in tone which I believe would match the effects of age , weathering, and exposure to sunlight over time. My Tripe has also a darker more brownish shade adding a small amount of the RAL 8017 but is still in the "greenish" spectrum.
I believe it's all in the eye of the beholder; as I've stated many times when it comes to the "real" colours the only thing we can be sure of is............ were not sure! Great topic for debate though...........
Cheers,
Lance
