It's not really new dye, just new to me. I'm talking about Pro-Chem's Pro Liquid Reactive Dye Black LR604. It's a pure color, not a mix, and I love, Love, LUV it!
Here's some samples:
All pieces 36" x 44". Test Fabrics 400M cotton broadcloth. Painted, air dried, steamed for 30 minutes. I plan to color these with mx. We'll just see how that goes.