Here is a MS Word document with the color mixtures I used for my Spad XII and earlier Spad XIII. I used the WNW Salmson color guide as a starting point, and used articles from Lance Krieg and various articles from Alan Tolle to further guide me to the colors that looked "right" for me.
I used the AK aluminum as it seemed to be a finer pigment and a whiter aluminum than Tamiya. This gave the fabric colors a pearlescent finish, which I hoped reflected the "wet fish" look that Alan Tolle describes when referring to these colors. The pearlescence is hard to pick up on camera but does show in person. The Tamiya and AK mixed together, but they did separate if left for a long period, so I had to mix them before each paint job. Not sure if this was because they were two different brands or because the AK was a metal paint, as it seems to me metal paints (aluminum, brass, etc.) behave a little different from other colors. I sprayed and brushed the fabric mixtures with no problems. The Ripolin mixtures were sprayed. I used some retarder to encourage a smooth finish. I also used both Tamiya and AK thinner for each mix just in case the different brands needed some of their particular thinner.
