Take a few drops of fabric dye & mix with craft glue.
Stir paint and dye together and apply a light thin layer to the inside of glassware. Avoid applying too thick of a layer where the glue drips down the glassware and won’t hold the dye.
Allow time to dry. * TIP: The glue will dry clear, giving the glass a tinted look.
*TIP Instead of adding more dye to darken the glassware, apply more layers if desiring a richer color.