R12 Reichspost Red paint scheme

[steven boos]

"Motoradder aus Munchen" shows an R12 in Reichspost service that is neither black or grey. I understand that the Reichspost painted their vehicles red during this period, so the bike probably has a dark red frame with light red pinstripes. The tank is also light red. Does anyone have any information on this paint scheme? Does anyone know where there are mixing formulas for the Reichspost red colors? Regards, Steven Boos