Brand ล็กไลต์Brand ล็กไลต์ (black light), a UV-emitting tube wave length with purple-black. Use of important documents such as banknotes, passports, credit cards, etc., that are of real or fake. Several countries have produced a watermark that is not visible in this type of radiation. In addition, brand ล็กไลต์ can also be used to lure the insects came preinstalled with the later.
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