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Can you write with stones?
You can write with a soft stone on a harder stone; writing with chalk on slate is a familiar example.You can also write with a hard stone on a softer stone, using the harder stone as an engraving tool. There are a lot of examples of this on paleolithic artifacts.
What a piece of calcite is used to write or draw on blackboards?
It is chalk.
What is the difference between tailor's chalk and blackboard chalk?
Tailor's Chalk is made from magnesium silicate or Mg3Si4O10(OH)2. Blackboard/ Chalkboard Chalk is made from calcium sulfate or CaSO4. Both were previously made from chalk a form of limestone that is a soft, white, porous sedimentary rock composed of calcium carbonate or CaCO3. Other Names for Tailor's Chalk: Sewing Chalk, Magnesium Silicate, Soapstone, Talc, Slate Other Names for Chalkboard/Blackboard Chalk: Calcium Sulfate, Gypsum, Gypsum Plaster, Plaster of Paris, Drierite, Alabaster, Anhydrite, Desert Rose * Tailor's Chalk is used to temporarily mark clothing for alterations. * Chalkboard/Blackboard Chalk is used for writing and/or drawing on a chalkboard, blackboard, slate, or enamel board. * Tailor's Chalk and Blackboard/Chalkboard Chalk are interchangeable though the method of cleanup varies if the before mentioned chalk is used for it's intended purpose or another usage. * Chalkboard/Blackboard Chalk made from calcium sulfate is dust free. * Chalk Sticks are made from calcium sulfate (calcium & sulphur molecules chemically bound to water) aka gypsum in its dihydrate form (chemical compound containing 2 molecules of water around each CaSO4 group aka calcium sulfate hemihydrate * Chalk Sticks are made through calcination. Calcination is a treatment process of removing water from a substance or compound in this case calcium sulfate by heating the calcium sulfate to a high temperature that is also below melting or fusing point causing a loss of 50% to 75% of the calcium sulfate's original moisture producing a powder. When water is then added to the powder it rehydrates and quickly hardens. * Calcium Sulfate predominately comes from Gypsum or Anhydrite though it also occurs as a byproduct of several different chemical processes * Gypsum or Anhydrite occurs in many locations worldwide as evaporites (a natural salt or mineral sediment deposit left after the evaporation of a body of water) * Pastels are made from calcium sulfate mixed with clay, oils, & pigment * Soapstone is a metamorphic rock made mostly of Talc aka Magnesium Silicate * Soapstone aka slate is what blackboards were first made from though most modern chalkboards are made with steel treated with an enamel * Chalkboards can be made any color; Blackboards refer to the original blackboards made from soapstone aka slate * Modern chalkboards are made with tiling grout; one of the main ingredients in tiling grout is Magnesium Silicate same as original Blackboards and Tailor's Chalk * In early American schools children used a slate aka soapstone pencil to write on personal slate aka soapstone boards. These slate aka soapstone pencils were a cylinder of the rock inside cedar * Slate pencils were replaced by soft chalk aka calcium carbonate (CaCO3) later replaced by calcium sulfate aka gypsum (CaSO4·2H2O)
When written in wet chalk first it is not visible but later it is visible why?
Some of the chalk is dissolved into the water and so when you write on a board the chalk can not easily be seen. The water then evaporates leaving only chalk behind therefore becoming visible.
What kind of rock or hard surface to write on?
Plate
What is a piece of slate on which to write on with chalk named after a color?
You write on a blackboard.
How did the children write their diary in the days of Victorian?
At school it was normal to write with a slate penicil on a piece of slate (the slate pencil could be make of clay, soft slate, soapstone or chalk). The main advantage of slate was that it the marks could be erased and the slate could be reused.
Why can you use chalk to write on the blackboard but not granite?
Chalk is softer than the slate (real or artificial) used on blackboards, so it will flake off as you write. Granite is harder than slate and will not flake, but rather cut into or mark the slate permanently.
What did children write with during World War 1?
Chalk on Slate board
How is the term blackboards properly defined?
A blackboard is a piece of slate stone on which people can write multiple times and erase what they wrote. One can use chalk to write on the surface and then remove it easily even with bare hands.
Can you write with stones?
You can write with a soft stone on a harder stone; writing with chalk on slate is a familiar example.You can also write with a hard stone on a softer stone, using the harder stone as an engraving tool. There are a lot of examples of this on paleolithic artifacts.
What a piece of calcite is used to write or draw on blackboards?
It is chalk.
What did school children write on in the early 1700s?
School children lucky enough to go to school wrote on slate using chalk.
What does slate look and feel like?
Rough when it is fresh but when shaped it is smooth and cold. Slate is used as chalkboards. It is smooth, cool or cold to the touch, and chalk can leave 'marks' so humans can write or draw on its surface. Slate has been used for centuries in school (students used a single small "slate" to do their "figuring" -math- and to write words or sentences.
When you write on the board with a piece of chalk an irritating noise results when the chalk is held at some angles yet this does not happen at any other angles Why?
as of stone
What you use to write on the board is called?
it is called a marker, or you can also use chalk
Why is slate used as chalkboards?
Slate's slightly coarse texture allows bits of chalk to 'stick' to board. Its foliation (process of splitting into thin sheets) allows it to be broken or cut easily into pieces ranging from a small student chalkboard - or as big as a giant chalkboard for the teacher to write on. Slate is also very durable, although now slate chalkboards are being overtaken by 'white boards' and SmartBoards.
