This is an antique glass apothecary bottle with a fused glass label for "Mercury Ammoniat." 10” tall.
The bottle features a glass stopper and a hand-painted label, common characteristics of Georgian or early 20th-century pharmacy bottles.
Apothecary bottles like this were used to contain medicines in the 18th and 19th centuries.
Today, these items are highly collectible and often used for decorative purposes.
The white residue and contents appear to be original.
Disclaimer: The contents of this bottle are historical and likely contain toxic substances. Do not handle or ingest the contents

W.T. & Co. bottles are antique, high-quality glassware manufactured by the Whitall Tatum & Company (later Co.) of Millville, New Jersey, primarily between 1875 and 1938. Renowned for medicinal, pharmaceutical, and apothecary bottles, these are often found with embossed marks on the base, ranging from "W.T. & Co." (pre-1901) to "W.T. Co." (1901-1938) and later a "W" and "T" in a triangle.