Twibright Boiling Stones
- Quite chemically inert white porcelain boiling stones (aka boiling chips) suitable even for
chemical processing of food, pharmaceuticals, and cosmetics.
- Large stone mortar. If not available, replacement with hammer and anvil
or even two stones is foreseen (but untested).
- Cheap white porcelain bowl or plate with minimum print or colour (will be destroyed)
- Plastic plate (tested) or porcelain plate (untested).
- Safety glasses or at least ordinary glasses (tested) or sunglasses
- Work gloves if minor scratches are not tolerated
- Plastic cup or box with watertight lid
- Remove any stickers or sticker glue from the bowl
- Wash the bowl
- While wetting the porcelain with water, smash the bowl and remove pieces
with print or colour. I believe porcelain dust causes permanent damage to
the lungs and wetting prevents its formation reliably.
- Try to smash the porcelain into pieces as big as the fingernail of the
When the highest amount of these pieces in mortar is reached, stop.
- Pour the content of mortar with water on the plastic plate.
- Shake the plastic plate
- Pick up oversize pieces back into mortar
- Pick up the pieces and throw into the plastic cup until all what is left
- Discard the undersize.
- Repeat with the oversize pieces in the mortar until no oversizes are
- At this point there is no oversize anymore.
- Pour the content of plastic cup with water onto the plastic plate
- Shake plastic plate
- Collect pieces into plastic cup again until all left is undersize
- Discard undersize and repeat until no undersize is left
- At this point all boiling stones have the desired size.
- Fill the plastic cup with the boiling stones with water and close and
shake for 1 minute. This will chip off edges that have tendency to fall off
- Repeat the filtering procedure to get rid of the small chipped pieces
- Rinse with water
- Let dry
- Congratulations your boiling stones are ready now!
- Put into liquid before boiling to reduce violet bumping and splashing
- Boiling stones may or may not be reused depending on usage and desired
purity. Porcelain is porous and can absorb some chemicals which may or may not
release upon washing.