Digital BW, The Print

The OCP alternative ink set for the R1900 is actually dye based. Try a 
sample with the dyes you want to dilute whether the result is stable. 
The gloss enhancer is available in the UK in carts or bulk.

Like this:

https://www.refillsupermarket.co.uk/ocp-ink-epson-t0540-colorless-p-1752.html#.UOqNAEhKhO0

-- 
Met vriendelijke groet, Ernst Dinkla

http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
December 2012: 500+ inkjet media paper white spectral plots.