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Light Fastness

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2 replies to this topic

#1 Drawing61


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Posted 09 March 2018 - 00:58

Apologies if I've missed obvious information here or elsewhere. Is there a rating for light fastness for inks as there is for other pigments such as watercolor or acrylics? 

Love all, trust a few, do harm to none. Shakespeare

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#2 Torrilin


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Posted 09 March 2018 - 02:42

Most fountain pen inks are dye based, not pigment based. There’s definitely differences in the lightfastness of different dyes, but I’m not aware of any classification system like we have for pigments. And fountain pen inks seem to primarily use acid dyes, which don’t bond well with cellulose fibers. And I know most dyes will exhibit different lightfastness behaviors before and after they react with their target, so that makes things harder.

There’s some pigment inks that do work in fountain pens! But none of them are labeled the way paints are.

#3 Corona688


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Posted 09 March 2018 - 02:52

Most fountain pen inks are dye based, not pigment based.

Which these days means a few hydrogens less or more on the same molecule.

And fountain pen inks seem to primarily use acid dyes

This is a subject I'm interested in, I'd like to know more please.

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