formalin

It is frequently desirable to detect formalin, which is the most common preservative added to cow's milk.

Formalin is the best disinfectant for wall-paper unless the child has spat upon it—then use the bichloride.

Use formalin or sulphur in the infected rooms, and classes may be begun again the next day.

The substances commonly used are carbolic acid, formalin or formaldehyde, lysol, and bichloride of mercury.

Its position was marked by a wire thrust through the wing at this place, and the wing (H) is preserved in formalin.