Leonardo did not 'paint' it. This was one of his many drawings, and it could have simply been because he had red chalk on hand when he decided to sketch out this self portrait.
chalk board paint is about $12 a pint regular paint is about $12 a gallon
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Dark exterior colors absorb heat and ultraviolet rays which are both very oxidizing elements therefore dark exterior finishes generally chalk up sooner and require more frequent maintenance
Tailor's tacks, which are marker stitches Tailor's chalk, which makes chalk marks Chalk paper, which is used in a similar way to carbon paper but uses chalk dust to mark
Chalk is harder than rubber. Chalk is a form of limestone made of calcium carbonate, which is a relatively hard mineral, whereas rubber is a soft and flexible material typically made from natural or synthetic polymers.
With every stroke of the chalk piece it leaves some of the chalk on the board. This abrasion of the piece of chalk causes it to wear down. This is similar to why the rubber tyres of cars wear down when they are driven over a road surface.
near a chalk board
Chalk
The Luhya translation of the English words 'chalk board' is "lisisi lie ichoka".
Water
A compound word with chalk is chalkboard.
5x2x1.5
My sister is two, and shes still at that point of drawing all over everything. I would say about 5 would be a good age. What we did though is got the chalk board paint and painted a wall in our kitchen and got her chalk. She loves it!
a chalk board
A rubber band would be more easily broken than a piece of chalk or a skirt. Rubber bands are designed to stretch and be flexible, making them more likely to break when stretched beyond their limits. A piece of chalk is more rigid and a skirt is made of fabric, which are not as easily broken by stretching or bending.
maybe it might be near the chalk on the board