Glazes
From Principles of Applied Arts
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Composition
Reference: “The Art of Fauxâ€, page 22
Paints usually have a thick consistency and are formulated to suit the purpose of hiding substrates with a solid opaque color. Glazes could have the same chemical make up yet are formulated proportionately with more solvent.
Glazes are more fluid and made to spread thin.
Glaze has more solvent which makes the paint translucent.
Glazes are both acrylic and oil based
ACRYLIC GLAZES
2 Types of Acrylic Glazing medium on the market :
With Binder = Scumble Glaze: mix with tint only; do not add paint (If paint is added, the amount of binders is doubled. This will speed up the drying time and decrease the *Working time.) The ratio of scumble glaze to UTCs determines the value of color, but not the drying time.
Without Binder = Latex Paint Glaze: mix with paint. This type of product is an acrylic solvent and typically has no binder in it at all. Paint glazes are sometimes called “extenders†Be careful if your solvent to binder ratio is too high your finishes become fragile and can wash off. These products rely on the binders in the paint to make them durable. Some paint brands have stronger binders which can effect drying time of the glaze. The ratio of paint to paint glaze is usually:
4 parts paint glaze/extender: 1 part paint
Note: Using paint as a colorant in a glaze has translucency limitations (see Paint Bases)
“Open time†under the definition of :(a liquids ability to stay wet when exposed to air) is relevant only to its “Working time†being defined as a liquids ability to be manipulated on a semi porous surface with semi porous tools, because this is the application method of glazing liquids 99% of the time.
Within the two types of acrylic n the market there are fast and slow drying mediums. A fast drying acrylic medium can be uses on small areas and has its application when you would like to apply a multiple of layers without having to wait a long time in between layers. A good fast drying glaze that has been used for 3000 years is made with beer and pigment this is called a reversible glaze medium
OIL GLAZE
There are many pre made oil glazes and they all differ in composition (see product ref. page)
example of a simple Linseed oil Glaze = Color (artist oils or pigment) + 3 parts turpentine (english turpentine) + 1 part Refined linseed oil + 5% Japan drier (Kleen strip) This mixture looks like iced tea.
Oil base mediums like glazes usually form a stronger film than acrylic based and have more working time the trade off is the odor and more difficult clean up. Here is a way to make this glaze semi oder free and a way to clean it up with water:
A hand made odorless oil glazing mixture with low sheen and the most working time of any glaze would be: 1:1 Refined linseed oil:Sansodor with 5% japan drier and to make the sheen matt add 10% by volume refined Talc This will yield a working time of 1 1/2 hr and dry in 12 hours.
To clean this up using water you would wash your brushes with Klean strip brush cleaner and then with a soap and water. Some people use shampoo and conditioner for their brushes after the brush cleaner.
NOTE: if you soak the brushes in the cleaner it is hard on the bristles, so just treat it like a soap. you can't use oil in a brush that has water in still in it from cleaning.
See oil glazing
links
LIME GLAZE
mixing water with a lime paint makes a good fast drying glaze. Note that if the lime paint has a large amount of white pigment in it, it becomes opaque and this is called a wash.
MEDIUM STRUCTURE CHART
PERFORMANCE CHART
Glazing defined
Glazing: Putting a layer of translucent or see-through color over an opaque color. Antiquing using glazes gives the impression of age and Patina
Glaze in painting is a transparent medium. Whatever is on the surface beneath the glaze shows through applied medium. A glaze changes the color cast or texture (gloss or matte, for instance) of the surface. For many centuries painters have applied glazes to their works.
When the technique is used for wall glazing, the entire surface is covered, often showing traces of texture (French brush, parchment, striae, rag rolling). Either oil-based or water-based materials are used for glazing walls, depending upon the desired effect. Kerosene or linseed oil may be used to extend the "open" or working time of oil-based glazes. Water-based glazes are sometimes thinned with glycerin or another wetting agent to extend the working time. In general, water glazes are best suited to rougher textures where overlaps of color are acceptable. Scumble is a technique similar to glazing, except that coating is opaque.
