These were carefully removed using a diamond saw and grinding wheel, after which the rock slabs were cleaned with ultra-pure water in an ultrasonic bath before crushing and powdering.
Powdered coal or coal for powdering could be stored at less expenditure, and with a less elaborate storage.
The surface has been treated with polyurethane sealer to prevent powdering, and that treatment will be repeated as necessary.
He estimates the majority of the women waste an average of four hours a day making cups of tea and powdering their noses.
White colour is made from the conch-shells by powdering, boiling and filtering in a very hazardous process.
Upperside semitransparent white, sometimes slightly infuscate with a powdering of black scales.
In 1750, women began dressing their hair with perfumed pomade and powdering it white.
Acidic leathers are particularly vulnerable to red rot, which causes powdering of the surface and a change in consistency.
