stonefoki.blogg.se - Where to buy real chalkboard

On the other hand, chalk produces dust, the amount depending on the quality of chalk used.

Chalk is mostly biodegradable, whereas most plastic recyclers will not take whiteboard markers.

Chalk can be easily removed from most clothing whiteboard markers often permanently stain fabric, wood (wood frame), etc.

Chalk can be easily erased writing which has been left on a whiteboard for a prolonged period may require a solvent to remove.

Chalk writing often provides better contrast than whiteboard markers.Chalk has a mild smell, whereas whiteboard markers often have a pungent odour.Dashed lines can be drawn very quickly using a technique involving the friction of the chalk (or chalk marker) and blackboard.It is easier to draw lines of different weights and thicknesses with chalk than with whiteboard markers.Chalk is an order of magnitude cheaper than whiteboard markers for a comparable amount of writing.Chalk requires no special care whiteboard markers must be capped or else they will dry out.Chalk sticks containing calcium carbonate typically contain 40–60% of CaCO 3 ( calcite).Īs compared to whiteboards, blackboards still have a variety of advantages:

White chalk sticks are made mainly from calcium carbonate derived from mineral chalk rock or limestone, while coloured or pastel chalks are made from calcium sulphate in its dihydrate form, CaSO 4♲H 2O, derived from gypsum. Sticks of processed "chalk" are produced especially for use with blackboards in white and also in various colours. Cardboard box of chalk sticks, made in GDR, currently at the MEK