Is it safe to add hot liquids milk glass?

It depends on the type of milk glass. Some milk glass, such as Pyrex, is designed to withstand high temperatures and is safe to use with hot liquids. However, other types of milk glass, such as antique milk glass, may not be able to withstand high temperatures and may crack or shatter if hot liquid is added. It is always best to check the manufacturer's instructions before adding hot liquid to milk glass.