Best guess is a black base. Light drybrush with red, heavy near the joints. After this, a pinwash in the joint, perhaps a light wash on the underside of the legs to add shadow. Maybe a light dusting of an orange or yellow on the extreme highlights. That said, if you had access to an airbrush, it might be airbrushed instead of drybrushed. Probably quicker and easier. It's practically what airbrushes are designed for. Fading colour, that is. You could also achieve this with thin glazes. Start with red, add a (super) thin black wash. Wait to dry, repeat, but not quite the full length. Wait to dry, repeat, but not the full (part) length as before. Wait to dry, repeat, starting a little closer to the end tip of the leg. Repeat until you can't stand it anymore. Closer layers will result in smoother colour transition, but faster, so the colour fade will be a short distance rather than a long distance.
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