Digital BW, The Print

I have just now retired Epson 4000. It has an over heating problem which is not worth fixing. (I replaced it with a 4900 the price for which just dropped about one-third.)

The 4000/Epson ink combination was not good for b&w and since I occasionally like do to b&w, I'm thinking about dedicating the 4000 to it. What would be good ink to use? I looked at UT 3D inks for the 4000. It doesn't say they are carbon inks, are they?

I'm open to suggestions. Thanks.

DX