Sodium Hydroxide Bottle This is an amber glass, empty bottle of Sodium Hydroxide. It features a white and red paper label describing its former contents as follows, in black handwriting: “Sodium Hydroxide NaOH n/10" and in white ink “NOT TO BE TAKEN. FANNIN & CO. Ltd. Chemist & Surgical Instrument Makers 41, GRAFTON STREET, DUBLIN.” A smaller circular label says “41 GRAFTON ST, DUBLIN". The bottle is hexagonal and features two embossed sides with longitudinal embossings, and embossed writing: “NOT TO BE TAKEN.” Sodium hydroxide (NaOH), also known as caustic soda or lye, is a strong and versatile chemical. It looks like a white solid and dissolves easily in water, creating heat. NaOH is used in many industries, such as making paper, soap, and detergents, treating water, and processing food. It is very alkaline and can neutralise acids, clean surfaces, and help in food preparation. Because it is corrosive, it must be handled carefully with proper safety measures. 1900-1949