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A Filter of some sort
Since the object appears violet to your eye, it must be that violet light is the wavelength most efficiently reflected ... least efficiently absorbed ... by the object. To a greater or lesser degree, all wavelengths that are not reflected from the object are absorbed by it.
Percolating
casing drift is an inside diameter for the casing which allow any drift size pass through this casing with 1/8" under gouge
Gravity can be found everywhere on Planet Earth, the force that keeps us on the ground and doesn't allow us to fly is called gravity.
A Filter of some sort
Transparent materials allow light to freely pass through them. Translucent materials also allow light to pass through them, but change the colour of the light.
permeability
Materials that allow energy to flow easily through it are called conductors.
Those are called insulators.
permeability
permeability
conductors
It is called conductivity
Materials that do not allow electric currents to pass are called insulators.
Opaque materials do not allow light to pass through them.
Transparent materials will always allow light to pass through, translucent materials will allow light to pass through as well but the light rays will be scattered. Opaque materials will not allow any light to pass through.