These pretty crushed glass colours (approx 1mm - 3mm in size) are great on their own and also mixed in with stones and shell chips. An easy way to produce a terrazzo style effect. Provided in a small clip seal bag.
How to use -
Mix through the compound after you have added your pigments 
Pour into mould and tap a little to make sure there are no air bubbles around the little glass pieces.
On demolding carefully use a small circling motion with a very soft cloth dipped in vinegar, or a BBQ wipe (the ones with the little knobs for scrubbing) to expose the glass. Make sure to rub over the whole piece evenly. You can use a fine sandpaper also (wet sanding).