Dremel 876 Specifications download pdf (Page 21)

for food and drink. However, this may not be apparent until

months later when the glaze has delayed crazing of the

surface. All glazes should be from reputable manufacturers.

They should have the proper seals from the ASTM guidelines

for food containers. Remember that food safe glazes, when

mixed together or applied one over the other, combine chemi-

cally and could produce a finish that is not food safe. Glazes

that do not meet food safe requirements will only release

contaminates when in contact with acidic foods. Some glazes

do meet the government's tests but are unsuitable for

dinnerware due to their texture or glaze surface.

Make your piece safe for food and drink by following these

three rules:

•Choose only dinnerware safe glazes.

•Use acceptable bisque pieces that are smooth and in

good condition.

• Fire the piece to the recommended temperatures during

the bisque and glaze fire.

A glaze is safe for food when it passes the U.S. governments

test for lead and cadmium release. A glaze that is unsuitable

for inside surfaces because of their texture can be used on the

outside of containers. It is only the surfaces that will come in

contact with food that need to receive extra caution.

Opacity of a Glaze

There are times in the decorating process when there will

be a need to know the opacity or translucency of a glaze. Few

colors are completely transparent, and since they are a form of

glass, few are completely opaque, but there are lots of stages in

between. There will be times where a glaze containing

speckles or with slight coloration is preferred. Then there are

the times when you have totally changed your mind and want

to cover up completely the underlying colors. Darker colors

applied heavily are more opaque. Opaque glazes applied

thinner are still more opaque than lighter colors applied

heavily. This can also be an indication on how carefully to

apply the glaze when used alone.

•Clear glazes add no color and will tolerate more variation

of the thickness of the application.

•White glazes applied over white clay bodies do not show

overlaps of color.

•Dark and opaque glazes seldom show the unevenness of

the color's application.

The surface also comes into play when applying the glaze.

Transparent or semi-transparent colors appear to flow into the

crevices and accentuate the details. On a smooth surface these

glazes should be applied carefully or the unevenness will show

up as colored patches. Applying the three coats at right angles

to the previous one will help alleviate this condition.

The codes for the opacity of glazes are:

Clear: the glaze adds only a wet, glossy look and brings

out the true colors underlying on the piece.

Transparent: the color underneath is slightly tinted with

the overlying glaze changing the appearance only a little

bit.

Semi-transparent: the underglazes underneath these are

identifiable, but are changed by the tone of the glaze over

them.

Semi-opaque: light underglaze colors will not show

through and dark colors will be muted. This can be very

effective for shadowing on animals, faces, etc.

Opaque: most colors will not show through.

Oxidation

The glazes used in ceramics are termed oxidation

glazes. This means they need oxygen to develop their color

during the firing. Oxidation also describes a chemical

reaction to the glaze with the fired metallic lusters put over

them. This change is due to the amount of copper involved

in the coloration of the glaze. Some colors with little copper

in them might only slightly affect the fired metallic luster.

Sometimes dramatic effects can be made by deliberately

putting the fired metallic on the glaze.

The Basics of Applying Glazes

•Generally applied to shelf cone 04 bisque. Check for

exceptions under individual glaze categories.

•Wipe the piece with a damp sponge before starting.

• Shake jar well before using. The thickness should be

about like ketchup.

•Use either an Oval Mop or Flat Glaze brush to apply

most glazes.

•Apply 3 flowing coats unless otherwise noted on jar.

Clear glazes require only 2 coats. Check individual

glaze categories for exceptions.

•Use food safe glazes on all containers for food and drink.

• Fire to shelf cone 06 unless otherwise noted on jar.

•All are water soluble.

Glazes

Sponging is as Easy as . . .

Sponge-on-a-Stick

Make perfect circles with

these sponges. Dampen

sponge with water, press out

excess. Dip sponge lightly in

color. Place on piece and

lightly twist.

Pre-Cut Sponges

Create complicated-looking

patterns easily! Dampen

sponge, squeeze out excess

water and blot on paper towel.

Brush color onto sponge.

Press onto piece.

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Dremel 876 Specifications Page 21

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