Marv, having a bit of OCD has been playing with formulas to better match Damage Ind. SHTF Brown.
His first effort is here.
Formula #3 was very close. Tonight we added an extra 1-1/2 tsp of Graphite to it.
So: 3 Tbsp of Chocolate Brown, 1-1/2 tsp Graphite, 1 tsp of Purple and 1 tsp of Aquamarine gets you:
Compared to the furniture he's trying to match:
While it's not quite a perfect match, I think we're at the limits of what we can do with Rit dye with this material.