Adding colour to glass

This afternoon I have been looking into how is best to add colour to glass pieces carefully and tastefully. I want to be able to create areas of depth and high detail, yet maintain the transparent effect of the glass, therefore the type of paint is very important.

"Paint selection is one of the most significant aspects of painting clear glass. Acrylic glass paint is opaque and adds artistic embellishment to clear glass. Resin-based glass paint dries transparently, giving clear glass the look of stained or colored glass. Once you choose your paint, consider its durability. Glasswork that is simply for show can take any type of paint, but utilitarian pieces that will be frequently handled and washed must be painted with durable bake-on paint"

• When applying colour to etched glass, it is important to apply the paint to the reverse side of the glass, in order to maintain the detail that has been etched.

• To ensure no areas of the glass are unable to let light through, it is important to add layers of paint gradually, so it is possible to guage when the glass begins to loose transparency. Some types of paint become more opaque once dry.

To add colour detail to etched areas only:
Link - taken from eHow

1.  Wipe the glass etching clean with a tissue to remove any dust that might have accumulated on it.
2. Apply the paint with your finger, a small dry brush or a cotton-tipped swab.
3. Allow the paint to dry for about thirty seconds.
4. Wipe with a clean cotton-tipped swab or tissue. The paint will only wipe off of the unetched areas.
5. Apply high gloss sealer to the etched areas and allow it to dry, if the colors are required to be more permanent.