Tom Norton’s Darkening Medium® is not an ink but an additive to be used to darken the original ink when a drawing needs that extra “punch”. Some artists will add black india ink to darken the colour of Walnut Ink. This will work but you will sacrifice the unique watercolour characteristics of the ink and lose the ability to lift colour or lighten areas.
The Darkening Medium® is very heavily pigmented and made with the same binder as the original so it can be added or mixed with Tom Norton’s Original Ink® without changing its working properties. It can also be used straight from the bottle. However, it is so heavily pigmented it will behave more like a Sumi ink and stain the paper and not lift as easily as the original.
This product is not made with walnuts, it has been designed to emulate the colour of walnut ink.
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