Sure John! It's called Eco-Flo, and sold at Tandy Leather. I was warned several times that they could not guarantee good results with it, as it's meant to dye raw leather, not pre-dyed leather.
Maybe I had good luck because I was going black, and black covered the tan so well. Or maybe it was because of all the work I had to do before dying the seats. I had unsuccessfully tried Duplicolor vinyl fabric dye, and as soon as I sat or knealt on the seat the color began to crack and flake. So after getting the dye, and the salesperson at Tandy telling me they didn't know how it would react to previous dyes or sealers, I began stripping the seat. My attempts with various cleaners didn't do well, so I got the hot stuff out and figured I had nothing to lose. Urethane reducer for thinning paint, and a scotchbrite pad. Lots of rubber gloves, as it seemed to soften them easily!
The reducer stripped the seats easily, turning the duplicolor into a liquid, which I wiped off with numerous rags as they filled with black mess. Once I had the seats back to bare tan again, I let them dry well overnight, and began applying the dye with a sponge (as the directions said) in circular motions. It took pretty nice the first coat, but a 2nd was needed to get them streak free. I gave them a third coat, but just because I had more dye.
After the seats set for a couple days I applied Eco-Flo conditioner sealer to the seats, and repeated a 2nd time after that dried. I used satin sealer, as I didn't want shiny leather. The seats looked great before the sealer, but without it they can be stained easily, so sealer closes the pores and makes them a bit more impervious, plus gives whatever sheen you pick for sealer. It's a carnauba wax base, so it can be buffed also later, if you want it a little shinier.
I'm putting new upholstery on my front seats, so I'm hoping the sheen matches, but if it's close it will be fine for the Falcon.
Here's the seat backrest. The hole on the top left is for the shoulder harness insert.: