I use Devlan Mud. It all depends on what tonal qualities you want in the red. Devlan Mud makes for a dirty looking tone (which I like), the Baal Red adds depth to the red, Thrakka Green (don't laugh) can look good if used right....and so on. As has been said, do some tests and see whats what.
Ogryn Flesh comes out really nice looking... I think the ogryn flesh doesn't give *as* dirty of a finish that Devlan Mud would (depending on the amount, I'm sure)... but also adds more depth than un-tampered Baal Red.
As others have said... try a couple tests and figure out which ending hue you're looking for.
I've used a very liberal black wash over red with great results also... and The Paint Monkey is recommending purple... so, really, there are a good variety of nice looking effects to try out.
I swear by Baal Red. I first tried it when I was painting pink horrors, which I primed black, based mechrite, highlighted tentacle pink, and then washed baal red. They turned out AMAZING because of it. Now I use it for my sisters of battle, which have red robes. Prime black, base it mechrite, wash it with baal and then highlight with blood red. It provides a very rich red, which I think looks great.
Painting a Saim-Hann Eldar force (primary color is red).. I have used a mix of different washes and techniques to get the desired effect.
So far... on my grav tanks, I've used Badab Black... heavily.. then gone back and painted over the "sloppy" areas to make the paint job look more crisp.
On my troops (jetbike riders, fire dragons, etc) I used 2 different methods:
Method 1: Privateer Press 'Red Ink' watered down 2:1 (it's kinda thick) over a white primer, then highlighted with Privateer Press 'Skorn Red' then highlighted with GW Blood Red.
Method 2: Grey primer, heavy drybrush of Skorn red (P3 paints) Devlan Mud wash, then Blood red highlights.
(For the fire dragons, i kept highlighting with various oranges/reds/yellows until I got a different effect.. but.. yeah, you get the idea)
I go for tabletop quality, not showcase quality.. so I don't know if this is going to tickle your fancy. However, I do get compliments on how my minis look when they're on the table. Hope this helps.
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