Title
Merck Calcium Phosphate Tribasic Bottle – N.F. Precipitated Compound
Author
Pharmaceutical Supply – Merck & Co., Inc.
Image
Description
This amber glass apothecary bottle labeled “Calcium Phosphate Tribasic – N.F. Precipitated” was produced by Merck & Co., Inc., a long-standing pharmaceutical manufacturer based in Rahway, New Jersey. It was used for prescription compounding and likely dates from the mid-20th century, based on label design and branding.
The black Bakelite-style cap is embossed with the Merck logo in a cross formation, and the contents — a bright orange residue — remain partially visible inside. The dual label designs on front and back reflect both a retail-style logo and a clinical compounding format for pharmacists.
Condition
Very good. Labeling is intact and legible on both sides. The glass is clean with no cracks or chips, though there is minor dust and residue present. The original cap remains tightly affixed and clearly embossed.
Gallery
Historical context
Calcium phosphate tribasic (Ca₅(PO₄)₃OH) has long been used in medicine as a calcium supplement and a pharmaceutical excipient. In compound pharmacy, it served as a bulking agent or binding filler in tablets and capsules.
Merck was a cornerstone of American pharmaceutical manufacturing throughout the 20th century, supplying not only finished drugs but also raw chemical compounds for hospital and pharmacy use. This bottle reflects the era when local pharmacists frequently compounded medications from base materials — a practice now rare outside specialized settings.
Curious Facts, Ephemera, and Trivia
The Merck cross logo was widely used throughout the 1940s–1960s on both consumer and professional products.
The N.F. notation refers to the National Formulary, which standardized quality for non-patented pharmaceuticals.
The powder’s intense orange color may be due to either lighting artifacts or minor impurities — tribasic calcium phosphate is typically white or off-white.
This bottle was designed for prescription compounding, not consumer sales — making it a rarer survivor than over-the-counter bottles of the time.
Excerpt
“CALCIUM PHOSPHATE TRIBASIC MERCK
N.F.—PRECIPITATED
For prescription compounding.”
— Merck & Co., Inc., Rahway, N.J.
Why it is in the Cabinet
This bottle is a beautiful example of mid-century American compounding pharmacy. It bridges the era between apothecary tradition and modern pharmaceutical mass production. The Merck logo, bold typography, and clinical label format make it a striking artifact from a time when the pharmacist’s bench was a site of real chemical preparation — not just pill-counting.
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