One Three Neck Round Bottom Pin. Physical Chemistry Laboratory Series. Metallic pin that changes color from orange to purple when cooled to 0 degrees Celcius.
Craft: Hard Enamel
Material: Zinc Alloy, Gold Plating
Dimension: 2.85 x 2.10 cm
Attachment: 2 Rubber Clutches
Thermochromic material degrades over time when exposed to light.
Three Neck Round Bottom Badge Pin - Metallic Hard Enamel
Three Neck Round Bottom Pin. Material is hard enamel on zinc alloy (gold plating) metal with two pink rubber pin backs. The material contains a thermochromic compound.
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