W & N inks are intended for \"Artisitic\" purposes and do contain a fair amount of shellac in them , which is why they dry so shiney. (Taste Bl***y awful)
I once tired to add Vallejo Matte Medium to some red ink.
Made an interesting and almost instant Jelly.
Used the red to enhance a Red armour once and it does give a very Lacquer-like shine to colours.