Sometimes the heroin can be cut with impurities that make people sick.
Water has to be pushed through a semipermeable membrane that blocks the salt and other impurities from going through.
It will purge the impurities from your blood, and, in another day, your appetite will be exceedingly strong.
Sometimes they become choked by the impurities of the oil and the flow is lessened.
Water of ordinary purity will do for most purposes, but the nature and quantity of the impurities must be known.
This is left to stand and give the impurities a chance to settle to the bottom.
The pure metal is found at the bottom of the crucible, whilst the impurities are either volatilised or dissolved in the flux.
This is agreeable to use, and appears to cleanse away all impurities.
The toxic action of the impurities of crude acetylene is discussed in Chapter V.
The rain cleanses the air of its impurities, and conveys them to the plants.