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  #31   Report Bad Post  
Old 04-05-2012, 12:42 PM
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Gigalot Gigalot is offline
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Re: Hansa Yellow PY3, PY74 do you use them? (lightfastness II)

"Strontium chromate can affect you when breathed in.." Yeah, it is not a lipstick yellow! . But it is a very difficult thing to "breath in" an artist`s oil paint if you are n`t a worker on chemical or paint factory.
There are too many substances better to avoid "breath in" including sugar or milk powder.
6 ml of white spirit or 4 ml of turpentine aerosol are breathing lethal doze for human, but too many painters in the past died after 80 or even 90 years old despite contacting with toxic paints and ingredients every day.

If toxicity is important thing - benzimidazolone yellow might be very good primary or lemon yellow. It is more lightfast than PY3 Arylide yellow 10G and less toxic than Cadmium yellow PY35. I prefer to use non-toxic paints, but without sacrifice of permanency

Last edited by Gigalot : 04-05-2012 at 12:55 PM.
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Old 04-26-2012, 01:08 AM
JPQ JPQ is offline
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Re: Hansa Yellow PY3, PY74 do you use them? (lightfastness II)

i tested winsor lemon (in aquarelle) looks like i cannot replace my py3. to me py3 is poorest kind pigment what i can use some them are impossible replace i still use also py35 but its opaque dont work all same uses. saddly russian aquarelle have few nice colours what are impossible replace and are very poor lightfastness (pigment red 12 for example).
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Old 04-26-2012, 02:46 AM
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mek42 mek42 is offline
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Re: Hansa Yellow PY3, PY74 do you use them? (lightfastness II)

Golden makes an anti-UV varnish for acrylics. I'm not sure if it would be able to be put on top of oils or if they make such a beast. I think this also would help to prevent photodegradation of pigments.
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Old 04-26-2012, 07:36 AM
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Gigalot Gigalot is offline
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Re: Hansa Yellow PY3, PY74 do you use them? (lightfastness II)

Chemical additives can give only temporal protection because they are sensitive to UV rays itself. About 3-4 years, I guess. (UV protected plastic bottles has ~3-4 years protection warranty)
Many Oil painters are conservative artists who prefer natural dammar varnish but excluding people, following old impressionistic ingrained idea which teach us to hate any varnishes and black pigments.
However, acrylic artists are much more chemical and industrial friendly people and often trust dodgy paint manufacturers

Natural dammar picture varnish is also a good UV protector, but I don`t know how much effective it is. Is anybody here who tried to test it?

Last edited by Gigalot : 04-26-2012 at 07:53 AM.
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