Digital textile printing with Dupont inks onto natural fabrics I am embarking on a project which will require me to get 50+ meters of heavy organic cotton jersey digitally printed. 

I have sourced a print house to do the printing at a reasonable price and they use dupont inks. They have told me that I don't need to pre-treat my fabric (which I am sourcing elsewhere), that dupont inks adhere well and that I won't lose much colour through washing. I'm not sure if this is actually the case. 

I was wondering if anyone has experience with these types of inks. I am concerned that if I don't pre-treat my fabric, the colour will fade too much. But pre-treating can be a costly endeavour which I would like to avoid if possible. It is important that I use natural fabric and that the print will withstand a lot of washing. I'm working on a limited budget.

Also, is it true that synthetic fabrics hold colour better than naturals?

Thanks in advance for any help
I don't know about the inks your referring to specifically but given your concern about too much fading, you may want to consider pre-treating your fabric and being done with it, esp. if you don't trust your print shop or its very important it is to my customer that the design not fade.  My perspective is more of from that of a professional artist/craftsman working on a project, although I would want to spend as little as possible, I would need to weigh the cost of doing it once well against the cost of having to redo something that didn't work out.  I hope this helps.