french chalk การใช้

• Most tailor's chalk, or French chalk, is talc, as is the chalk often used for welding or metalworking.
• You can make your own by mixing an absorbent powder like fuller's earth, talcum or French chalk with a cleaning fluid like naphtha.
• After many experiments, Du Boisson found a unique way to realize it by using a special glue, a warm clamp, and French chalk.
• The canvas was then evenly coated with a paste of French chalk ( " gopi " ) or powdered limestone and a binding medium and dried.
• The first step in his process is to reduce French chalk or talc to an extremely fine state of division by repeated grindings, elutriations, and siftings.
• In parts of Southern England, primarily Somerset, Dorset and Hampshire, the board is made of slate and lubricated with arrowroot powder or French chalk, which makes the polished ha'pennies glide with a very light touch.
• After this is complete, a layer of the material ( over an eighth of an inch in thickness ) is forced down upon and made to adhere to a thick zinc plate, the necessary pressure being obtained by means of an hydraulic press, the platen of which is faced with a polished steel plate, so as to communicate a good surface to the layer of compressed French chalk.