How and why watercolor doesn’t stick to crayons | STEM activity

Why is this happening ?
🖍️ When a paint brush loaded with watercolor paint is swept over a drawing made with crayons, the watercolor washes over the wax but does not adhere to it
🖍️ The reason is polarity.
🖍️ Water is a polar substance, which means the molecule as an attractive force. Wax (which is what the crayon is made of) is a non-polar substance, which means its molecules don't have an attractive force.
🖍️ We can confirm this property of crayon and water by melting crayon in hot water. You get molten particles of crayons and it doesn’t mix with water. You can easily separate them.
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