Historical information

Milk glass is an opaque or translucent, milk white or colored glass that can be blown or pressed into a wide variety of shapes. First made in Venice in the 16th century, colors include blue, pink, yellow, brown, black, and white.

https://en.wikipedia.org/wiki/Milk_glass#:~:text=Milk%20glass%20is%20an%20opaque,brown%2C%20black%2C%20and%20white.

Significance

The ointment smells faintly of tar, so it was proberly used to alleviate irritation of some sort.

Physical description

White glass container with brown ointment inside which is now almost dried up. Black screw lid, and no label to indicate contents. Indented base.

Inscriptions & markings

None.