Ammonia does not have impurities in it
These are impurities as organic compounds in different materials.
it might decrease or increase depends on the impurities added.:D
If you think to mechanical impurities- by filtering.
impurities such as nitrogen and carbondioxide
the chemicals had so many impurities that they were unable to conduct the tests.
Chicken nuggests
If you think to particles as impurities, non-refinned salt have particles of insoluble impurities.
The impurities grab on to the growing crystals
Floating matter in water known as suspended impurities Salts , minerals, aquatic matter etc. They impart colour, turbidity & taste to water.
This may depend on your skin type but some of the best and most recommended natural substances for facial moisturizer are: honey, yogurt and papaya. All without impurities or processing of course! Yogurt and papaya will help cleanse also as they condition your skin and honey is well known to be great nourishment for skin and hair.
Not really. One doesn't clean an impurity, one removes it from something. So either "remove all impurities" or "clean (something) of impurities".