I familiar (and shoot too) almost all Russian armor/ammo that in present in DCS. I used it for at least 12year long. Sometimes very hard to define the correct ammo tracer color because it's belong the lot of variables:
- the ammo origin: basically the Russian ammo factories use the orange/red tracer element. But some other (German, Hungarian, Bulgarian, USA etc. cartridge factory use a different one (green, yellow, white)
- the ammo storage age: very often the soldiers have to use a relatively old (10-20yr) ammo. In this case the tracer color is faded due it had some chemical changes as usual
- the projectile velocity: with higher velocity the tracer color seems to be lighter than the lower one.
- the ambiance variables / shooting altitude: in a dump day the tracer color is mostly faded than the clear sunny day. Also the ammo application altitude is important. In the Hungarian AF Mig-21 used a NS-23 ammo that produce very clean green tracer when the plane use as ground target practicing from low (~1000m) altitude. But if they use it from mid (~2-3000m) or an air targeting practice it's almost invisible because it produce a light yellow effect as well.
I have almost all of Hungarian, Russian and NATO EOD handbook, tech-manual and notes about lot of projectile, ammo, missile, rockets, marking, deactivation, components etc.. but every time when the projectile has a tracer feature this books used to a (...should be... seems to be) phrase to define their color.