for linocut relief I found when I printed light colour ink on a thin dark colour of mulberry paper it left a clean crisp inked line. I sourced a few sheets of black a while back from this
place. They ship worldwide. The product is good quality. I have ordered many times from this retailer.
It is pricey for a single sheet, and then the cost of shipping would have to be added. If you ordering from outside Canada might be less if your currency is greater in value than the Canadian dollar.
you might look into other retailers and compare similar product and pricing