[Scriptoris] Information sought

[Elaine]

I have never done or heard of anyone glazing gum arabic over a  
gouache layer, and I was a painter in several mediums for a long time.

To begin, I agree heartily with Hillary's advice. Mix before painting.

Secondly, I would suggest you do gouache test strips of one, then  
two, then three layers of gouache, no additives. Then glaze a third  
to a half of the strip and let it sit until dry.

Observe the results of each glazed gouache strip and the visual  
effects. Which one dusts off the most/least? Which one has cracking  
the most/least? Which one is the glossiest/ least glossy? Which  
color / brand fares best? Etc.

A similar style of study is Ike color fastness tests in which you  
paint strips and cover half the strips with some kind of light- 
blocking mask, let sit in the sun for a long time, then remove the  
mask to see what happens in degrees of fading when you hang the  
painting with that color on a wall that catches the sun. One color,  
Antwerp Blue, fades in room-light, but "comes back" if stored in a  
dark closet for a while, or that's what W-N said happens...

In any studies. make notes  on the test pages that you can keep and  
refer to. You may want to give a class/ workshop/ write an article  
later....
My philosophy is that if you are given the information, try it out,  
share what works so you can make another painter's life a little  
easier... That's very satisfying, I find.

YIS,
Lete
............................

On Jan 21, 2012, at 6:42 PM, Hillary Greenslade wrote:

> To add to that, from the Winsor and Newton site:
> Designers Gouache (opaque watercolors)
> http://www.winsornewton.com/products/gouache/designers-gouache/
> http://www.winsornewton.com/assets/Leaflets/ 
> win_10724_dg_a4_pdf_english.pdf
>
> According to the brocure, which is full of info: Layering  
> ColourDesigners Gouache is intended to be applied fairly thickly in  
> comparison to water colour.
> If diluted with too much water it may 'powder off' the surface when  
> dry. If applied in too
> many thick layers it may have a tendency to crack, due to the under  
> layers absorbingg
> water and Gum Arabic from the newly applied paint; this only  
> becoming apparent when
> dry. We would advise that fewer layers are definitely best when  
> working with gouache.
> (see also “Thick Colour/Adding Texture” in Mediums Section).
>
> Gum Arabic can be added to Designers Gouache when painting in  
> layers to reduce
> cracking. Gum Arabic should also be added to the colour when  
> airbrushing to ensure that
> the colour is not over thinned. However, the addition of Gum Arabic  
> should be kept to a
> minimum as it increases brilliancy, gloss and transparency if used  
> in large quantities.
>
> Gum Arabic and Ox Gal Mediums:
> http://www.winsornewton.com/news/making-water-thick-or-thin-gum- 
> arabic-and-ox-gall
> http://www.winsornewton.com/products.aspx?PageID=129&ProductID=879
> http://www.winsornewton.com/products.aspx?PageID=129&ProductID=880
>
> Hope that helps, Hillary
>
>
> From: Hillary Greenslade <hillaryrg at yahoo.com>
> To: David Brown <lddevin03 at yahoo.com>; "Scribes within Ansteorra -  
> SCA, Inc." <scriptoris at lists.ansteorra.org>
> Sent: Saturday, January 21, 2012 6:03 PM
> Subject: Re: [Scriptoris] Information sought
>
>
> Yes,  I believe you need to add a bit of water to the paint, then  
> add one drop of gum arabic.  The gum arabic is essentially a glue,  
> that needs to blend with the pigment granuals, and in order to  
> blend with the pigment, you need to add water to the mixture.  It  
> doesn't take much of the gum in the mixture, and too much can mess  
> it up.   Of course, I'm talking about adding the gum arabic to the  
> paint in a paint well on a paint pallet, not directly to the pre- 
> painted area on a scroll.
>
> Hillary
>
> From: David Brown <lddevin03 at yahoo.com>
> To: "scriptoris at lists.ansteorra.org" <scriptoris at lists.ansteorra.org>
> Sent: Saturday, January 21, 2012 4:34 PM
> Subject: [Scriptoris] Information sought
>
> Greetings good scribes! I am in need of some information. Can you  
> put gum arabic on dry gauche without having to re-wet the paint  
> color first?
>
> Devin
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