How do I print using *only* color ink cartridges?
So yeah, I have an Epson Stylus CX7400 printer, and I’m trying to print using only the color ink cartridges because despite having just replaced all four, the black has already run out. The printer will sometimes offer to use the color cartridges to do a composite with pink, yellow, and blue, but I don’t know how to make it just do that.
Is there any way to do this, or does there have to be at least a little black ink for it to print in composite mode?
I’d advise against ever running your printer when one of the cartridges is empty. You could definitely do damage to it, so it is really not worth the risk.

you should not do this. it can damage the printer. read http://www.ccs-digital.com/inkjetcare.asp
I know someone who did this with a brand new Workforce 500. A few days later he put in new black cartridge and his printer would not print in black at all. Fortunately, it was under warranty and Epson replaced it but I dont believe yours would be.
References :
I’d advise against ever running your printer when one of the cartridges is empty. You could definitely do damage to it, so it is really not worth the risk.
References :
http://www.castleink.com