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- Many coloured chalk role and characteristics[2012-11-26]
- Stroke is light color chalk works, with mouth blows can blow off many colors, so will the use of draw fluid is very important.Crayon color is extremely rich, there are as many as more than 550 kinds of colors for choice. Can draw the tonal very rich
- Chalk characteristic introduction[2012-11-26]
- Ordinary chalk a head of coarse, about two inches long, a head of thin frustum of a cone shape, very well-balanced, very hard brittle. Commonly used white chalk.Now, the domestic use chalk main common chalk and clean chalk two kinds, its main ingredi
- What is the chalk dust, chalk dust definition[2012-10-27]
- Chalk chemical compositionThe chalk is made from calcium sulfate dihydrate (commonly known as gypsum). Can be added to a variety of pigments made a nice color chalk. Gypsum is heated to a certain temperature in the production process, its partial
- Chalk detailed instructions[2012-10-27]
- 1 - chalk daily life widely used in stationery tool, generally used for writing on the blackboard. A component of the chalk is a white precipitate of calcium sulfate, is not easy to be decomposed, and particles smaller than dust. The ancient chalk us
- Chalk blown eye treatment?[2012-10-27]
- The dangers of chalk: chalk harmful, but Environmental friendly chalk! The fine particles of chalk strong germs adsorption ability, the composition of the chalk is an alkaline substance. Harmful bacteria, alkaline substances on the teachers and stud
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