SULPHURIC ACID

This acid is sometimes called "oil of vitriol," and when pure should be almost, or quite colorless, and should be kept in a strong bottle with a close fitting glass stop¬per, as the particles of dust, wood, cork, or other organic matter quickly imparts a dark, brownish color to it.
When diluting this acid it is highly important that the acid shoidd be poured very slowly into the water, and never the reverse. Both the acid and water should also be quite cold, as great heat is evolved upon mixing them. Shoidd a quantity of hot watet be suddenly added to an equal amount of sulphuric acid, a violent explosion is almost cer¬tain to take place.