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Ox gall solution is a wetting agent used to improve flow when mixed directly with water colours. It can also be used on very hard sized papers to reduce surface tension.
Seawhite of Brighton
Seawhite Block Printing Ink 300ml
Seawhite Travel Journal
Winsor & Newton
Winsor & Newton Cotman 8ml Tube
Seawhite of Brighton Compressed Black Charcoal Set