Watch Glass Collection

An engraving depicting an hourglass, 19th century
5310948 An engraving depicting an hourglass, 19th century; (add.info.: Date: 1873); Universal History Archive/UIG

Material used in intelligent label chips
Intelligent label chips. Technician holding plastic polymers used in radio frequency identification (RFID) chips. RFID chips could soon replace barcodes

Blood test. Drop of blood on a watchglass. Beneath the watchglass is a blood test result sheet

Gallium. Sample of the element Gallium (Ga). Gallium is a soft post-transitional metal, with a melting point only slightly above room temperature. In nature it is only found in bauxite and zinc ores

Sulphur. Sample of sulphur (S) on a watch glass. Sulphur is a reactive chemical element that is a yellow solid at room temperature

Calcium. Sample of the alkaline earth metal calcium (Ca) on a watch glass. Calcium is the fifth most abundant element in the Earths crust

Sodium borohydride powder on a watchglass. Sodium borohydride (or sodium tetrahydroborate, NaBH4) is a reducing agent prepared from diborane (B2H6) and sodium methoxide (NaOCH3)

Damp magnesium chloride. Magnesium chloride (MgCl2) is an inorganic compound consisting of one magnesium and two chloride ions. It is an eye and skin irritant and should be kept away from moisture

Transition metals. In general, the transition metal elements are hard and inert, and have high melting points. Some are strongly magnetic, such as iron, cobalt, and nickel

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Discover the intriguing world of watch glasses, a vital component in advanced technology. These thin, flat glass slides serve as substrates for intelligent label chips, where they come in contact with essential reagents. The material's transparency allows for precise monitoring of reactions. In the realm of medical diagnostics, watch glasses play a pivotal role in blood tests. They're coated with carbon-based materials, which interact with specific biomarkers, releasing telltale ions such as sulphur and gallium. These ions then react with calcium and sodium borohydride powder, generating a measurable electrical signal. Transition metals like gallium and sulphur are often used in the production of these glass slides due to their unique properties. The sulphur aids in the formation of a thin, uniform layer, while gallium enhances the sensitivity of the sensor. The damp magnesium chloride, applied to the watch glass, acts as a reducing agent, facilitating the reaction between the ions and the sensor. This intricate dance of chemistry unfolds on the microscopic level, paving the way for groundbreaking advancements in healthcare and beyond.