Dr. Ph. Martin's Bombay India inks offer powerful color in a convenient dropper-stopper glass bottle. These highly pigmented India inks not only remain lightfast and permanent, but are also totally waterproof when dry. They adhere to nearly all surfaces and are non-clogging when used in pens. Inks can be diluted with water and used with brushes in traditional watercolor techniques or in dip pens, technical drawing pens, and airbrushes. One of 24 different colors in 1.0 oz. (30 ml) glass bottles with droppers.
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Reviewed in the United Kingdom on 28 November 2018
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I have not bought this for drawing, but for fixing imperfections on photographic lenses and their barrels to amend flare issues. It is very dark and absorbs light hitting on it, great to accompany flocking material or for reaching areas where flocking material cannot be installed. It applies easily and can be removed with ethyl alcohol. My only small issue is that it is not 100% water resistant on lenses - but anyway it is not a product made for such usage.
I do airbrush paintings and had previously used gouache paint, which is quite thick and requires the addition of some water to dilute it enough to not block the tiny nozzle in the airbrush. This ink however can just be used "as is" and being a fairly thin liquid works perfectly when undiluted in a .15mm airbrush. (teeny weeny nozzle :-). I bought black just to try it, but will now probably get loads of other colours... oh deep joy!
I did not used it with water, i only used it in my fountain pen from faber castell, and everything seems fine. Ink dries very quickly on the paper, black is very very very opaque, for that price its really really worth it. I have not noticed any clogging, so its really good! But I have bad news for people who wanted to use this ink with alcohol markers - alcohol markers are smudging the ink. So you have to use the ink on top of a marker you cant use it as linework. But it works absolutely great with watercolours and gouache so at least that!