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By having the sample rubbed with a piece of cotton wool rinsed in nitric acid and comparing the colour against a set of known purities.
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Friction strips electrons so the rubbed amber would take on a negative charge. Actually, friction causes charges to shift. Charges are indeed stripped from something, but they are collected up by something else. Amber does, indeed, become negatively charged by rubbing it with, say, fur. The phenomon is called triboelectric effect. And a link is provided.
The percentage of gold in gold bearing alloys. Measuring - by having the sample rubbed with a piece of cotton wool rinsed in nitric acid and comparing the color received with a set of known purities
the # 5 would be scratched
When refill is rubbed with plain did the paper pieces
A 'metal filing ' is a tiny piece of metal that is rubbed off from a large piece by a file.
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Not sure about a Peace of fur but when it is rubbed with a piece of fur you will get static electricity building up on the rod.
The wood changes color
The silk picked up positive charges.
By BC 600, a philosopher by name Thales rubbed fur by amber and found that rubbed amber attracts piece of fine particles. This was the first experiment conducted I think so.
Maybe someone picked up a piece of "magnesian" rock on an Aegean coast and noticed the piece of lodestone was peculiar. It attracted a piece of iron, and could change the properties of the iron when the iron was rubbed with the rock.
what would happen if a large piece of steel wool was used? A much smaller piece
Sandpaper gets warmer when rubbed against wood due to friction.