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Question asked 2022-04-19 13:50:29 ...
Most recent comment 2022-04-26 22:17:43
Acrylic
Concerning use of Sennelier's painting medium Medium Fluide Brilliant with acrylic paints, usually also Sennelier, but occasionally with acrylics of other manufacturers. Questions: How far may the medium be diluted with water before it is too diluted to form a reliable film? I am thinking especially of the case of using the acrylic more as a tinting medium, highly diluted, for the Fluide than for the acrylic's own binding properties. What is the medium's degree of permanence? Are there any pigments or paint dyes used in acrylics that are to be avoided when using it? Are there any other cautions for its use? Its handling characteristics and its transformation time from tacky to hard seem distinct from other acrylic mediums; is its composition significantly different from others?
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Moderator Answer
(brian baade)
I am glad that you were finally able to post here. Sorry for
the difficulty. I will speak about generalities here but will reach out to
Sennelier to see if they would like to comment on particulars. In general,
gloss acrylic dispersion mediums can be diluted to whatever degree the artist
wants. The affect on the paint will diminish with dilution (eg a gloss medium
will impart less gloss the more it is diluted) but it will not become an unusable
film. There are, of course, restrictions on this. A super dilute and bodiless
paint film will not adhere as well at a glossy richly bound one as compared to
applying it over a less glossy film. However, acrylic dispersion paints are far
more flexible in terms of this than many other paint media.
Sennelier is a professional paint brand and they have gone
through the work to make sure that their binders are compatible with the
pigments they chose.
I will forward this to others here that have more experience
with acrylic dispersion paints and representatives of Sennelier/ Savoir Faire for
comment.
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Moderator Answer
(mkinsey)
It's been a very long time since I've encountered an artist's acrylic color that is incompatible with mediums from a different brand. Genuine Viridian pigment (hydrous chromic oxide) will cause most acrylics to clot, so it's generally excluded from acrylic colors. In terms of liberal use on the palette, I agree with Brian, a high proportion of acrylic medium in mixtures poses no problem. Just make sure that the product is an actual acrylic medium, rather than something like a retarder gel, which doesn't include any acrylic dispersion and which should not be used in excess of what package directions indicate.
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Moderator Answer
(mirjam hintz)
We are not familiar with this specific acrylic medium, however we have tested a number of Golden acrylic colors for maximum dilution (see https://justpaint.org/how-much-water-can-you-safely-add-to-acrylic-paint/) and you could test your colors and mediums for the same parameters. Namely adhesion when diluted to extreme levels and color lift when continuing to paint over these dilute washes. Colors we tested that are typical of our line, like Yellow Oxide and Phthalo Blue Green Shade, showed no sensitivity to water or various acrylic products even when thinned with 20 parts water. In fact, sensitivity was mostly limited to worst-case scenarios of highly thinned down mixtures (1:20 and 1:100) involving pigments like Raw Umber, which has a high clay content, or the more dye-like Anthraquinone Blue.
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