• This topic has vi replies, 5 voices, and was last updated eleven years, 2 months ago by Ron Francis.

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  • Dec iii, 2010 at 12:16 pm #988867

    I have been an iconography educatee for 10 years. I have adult a contact allergy to dry out pigments (at least, to ochres, which comprise a lot of what I use on icons). I employ a dust mask to go on from animate the stuff when necessary, but at present that I accept an allergic reaction on touch, it'due south time to shift media.

    I take worked in acrylic and gouache before. Here is my question: over traditional gesso, and a traditional foundational layer of egg tempera pigment, can I consummate the icon I was working on using gouache or acrylic without scraping the whole icon down to the wood and re-gessoing with acrylic gesso? (ETA: even every bit it is, of course, I'll have to wearable gloves to pigment the side by side layer…merely I'1000 not willing for that to be my constant way of work, then hence the switch in media.)

    Thanks in advance for your help!

    Jan the itchy fingers (and I don't mean theft-oriented! lol)

    Dec 4, 2010 at 9:41 am #1144390

    I'm going to speculate what yous might practise, and and then someone can jump in with where I am wrong.

    I understood that painting with tempera is most like painting with oil and information technology's not recommended to paint acrylic over oil. Withal, if egg tempera dries completely and quickly, y'all could maybe use a clear acrylic spray over what you have done and then far, so keep on in acrylic.

    With allergies, you might demand someone to exercise the spraying for you.

    December six, 2010 at half-dozen:39 pm #1144392

    Chemically, egg tempera and oils are not at all alike. Recall the one-time rule "fat over lean". Oils are fatty, egg tempera is lean. I don't come across why yous would have any trouble putting annihilation over tempera, its almost as "lean" as y'all can go with paint outside of watercolors, and information technology'south very stable, hard. Good luck.

    Dec 6, 2010 at 6:43 pm #1144393

    PS: I call back in the reniassance when oils were first discovered painters would do underpaintings in tempera before they applied oil paints.
    I wonder if anyone on WC knows virtually this?

    Jan 21, 2011 at xi:00 am #1144389

    I think yous should have your questions to AMIEN. where your issues will be addressed past experts:

    http://www.amien.org/

    Personally, I don't understand how painting in acrylic or any other medium volition assistance if your allergy is to paint. All types of paint use the same pigments.

    March 26, 2011 at 11:56 am #1144391

    I'one thousand an egg tempera specialist and teacher.

    I'm deplorable, acrylic is a problem over tempera. Although tempera is "bacteria" than oil paint, it yet ultimately relies on drying oils plant in the yolk for its qualities and characteristics. Egg tempera is chemically more closely allied to oil paint than anything else. Therefore acrylic over tempera will eventually accept the aforementioned problems every bit over oil paint: lack of adhesion, flaking and delamination.

    Gouache is problematic for similar reasons.

    Oil was traditionally painted over egg tempera considering of this affinity. I would recommend, if yous wish to terminate in a different medium, use oil paints.

    I would also recommend that egg tempera painters use wet pigment pastes rather than dry pigments whenever possible, and wear protective gloves.

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