Hansa yellow light (PY3) lightfastness in mixturesApproveRejectUn-ApproveSubscribeUn-Unsubscribe
Question asked 2020-06-23 01:28:13 ...
Most recent comment 2020-06-25 06:52:32
Pigments
Dear MITRA people. I have a large amount of Gamblin PY3 oil-based etching ink but have been reading recently that the lightfastness of this pigment is questionable. On further reading about it in the Just Paint newsletter from Golden in an article from 2018 about changes to their yellow range in acrylics, it seems that this poor rating is based on its behaviour as a tint when mixed with titanium white and it was suggested that there might be some sort of adverse synergy going on between them in acrylics.
This article however also mentioned that it was performing well in oils (and strangely, watercolours). I do know lots of oil painters who feel it should be avoided, What is your opinion of the lightfastness of this pigment in oils (whether paint or printmaking ink) and would it be fair to imagine that if I use it in mixtures that don't include a white, it should be reasonably reliable?
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Moderator Answer
(brian baade)
Golden is on the forefront of this discovery of the change
in lightfastness rating for PY3. There is little that I could add. Maybe our representative from Golden has additional info, I will
message them about your post.
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Moderator Answer
(brian baade)
Sorry that is not what I meant. I was trying to say that a pigment that is less than lightfast would survive better is untitnted but would remain less that permanent. I was not commenting specificall on PY3. I will remove that sentense so as to not confuse people in the future.
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Moderator Answer
(mirjam hintz)
When we tested PY3 in oil paint we observed acceptable lightfastness in both masstone and tint. In oil PY3 had Delta E changes that fall in the upper half of the LF 2 range, which is Delta E 4-8. However, that is a change, which would be noticeable by eye. To get an idea ASTM lightfast ratings we have an article here: https://www.justpaint.org/delta-e/
Mirjam Hintz (Golden Artist Colors)
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