Yes, indeed, Silk black in fact, Pro-Chem’s #610.
My favourite for silk cloth. Drop a little in a wet sink and look at all those colours! Add a bit more water and the colours merge into a rich black and all its various shades of gray, and best of all, they don’t split – no halos, no spotting, and no tell-tale under tones. Just black. This is specially important when I am over-dyeing a resisted item like the one below and I want a no nonsense black background.