[Ink terminology]
Fluorescent ink An ink made of a fluorescent pigment has the property of converting short-wavelength ultraviolet rays into longer visible light and reflecting more brilliant colors.
Fluorescent inks, ie, UV fluorescent inks, also known as colorless fluorescent inks and invisible inks, are made by adding corresponding visible fluorescent compounds to the ink. A special ink that emits visible light (400-800 nm) by ultraviolet light (200-400 nm) and is called an ultraviolet fluorescent ink. According to the excitation wavelength, it is divided into short wave and long wave. The short-wavelength ultraviolet fluorescent ink with excitation wavelength of 254nm is called long-wave ultraviolet fluorescent ink with excitation wavelength of 365nm. It is divided into three kinds of colorless, colored and discolored according to the color change. The colorless can display red, yellow and green. Blue and other colors; colored to brighten the original color; discoloration can change one color to another.
A Door Hook is a tool consisting of a length of material, typically metal, that contains a portion that is curved or indented, such that it can be used to grab onto, connect, or otherwise attach itself onto another object. In a number of uses, one end of the hook is pointed, so that this end can pierce another material, which is then held by the curved or indented portion.
Door Hook
Door Hook,Over Door Hooks,Double Door Hook,Adjustable Door Hook
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