Glazes provide one of the most expressive and diverse forms of embellishment in glass gilding. This is where we paint the glass with a non-opaque glaze paint and back it with leaf. By combining paint and metal we can alter the color of the metal, build complex finishes using marbling techniques or create fully developed pictures with the reflective glow of metal shining through the various layers of paint. They are stunning with the right lighting.
I generally use genuine gold leaf but this is one area where the cheaper imitation leafs can be very useful.
The paints used (oil based) can be fully transparent, like those used for imitation stained glass which allow full metallic reflection. A translucent glaze of varnish or goldsize tinted with normal opaque lettering enamel obscures the reflection a little more for a softer effect. The more lettering enamel is added the less metallic it is. Printing ink can also be mixed with gold size for a transparent finish but I don't know how good its fade resistance is.
A simple color change can be done by painting the appropriate color onto the glass and either gilding directly onto this when it's tacky or letting it dry and gilding it later with either water or oil methods. When glazing, you can't get the full bright finish of straight water gilding. For a more interesting glaze you could add to this some texturing or add another color in a broken finish.
The picture shown here is painted with transparent glazes and backed up with copper leaf. It has up to a dozen layers of glaze in parts. I built up the picture adding a color at a time and going over all the areas of the picture that color was needed. The darker areas where built up gradually this way. The door windows and light cast from it onto the table/vase were left unglazed and are thus plain copper. When it was dry I oil gilded the copper backing which gave it a glorious warm glow.
Layered glaze with gold fleck This finish seen in my work uses layered broken color and gold for a rich complex effect. The method bears some similarities to marbling.
It looks good in a combination of dark green and brown (burnt sienna). Keep the colors subdued dark and earthy for a pleasing natural finish that always looks great.
Using strong hues of blue, purple, red will emulate opal.