![]() ![]() ![]() A tube black light is a basically a fluorescent lamp with a different sort of phosphor coating.In the next section, we'll see how phosphors are used in regular fluorescent lighting and in black lights. A phosphor converts the energy in the UV radiation from a black light into visible light. What you see glowing under a black light, whether on a fluorescent poster or an invisible hand stamp or a newly washed white T-shirt, are phosphors.Ī phosphor is any substance that emits visible light in response to some sort of radiation. Ultraviolet light frequencies are above violet on the spectrum and are invisible to the human eye. A black light bulb produces UVA light (as opposed to UVB light, which is much more harmful). How Sunburns and Sun Tans Work discusses ultraviolet light and its effects on our skin. Above violet is ultraviolet light, which we cannot see. Our eyes can see visible light in a spectrum ranging from red through orange, yellow, green, blue and violet. What you cannot see is the ultraviolet light that the bulb is also producing. If you turn on a black light bulb in a dark room, what you can see from the bulb is a purplish glow. We'll also see why black lights make some objects glow but not others, and we'll look at some interesting black light applications. In this article, we'll find out exactly what's going on here. Many amusement parks use hand stamps that are invisible until you view them under black light. You may have also seen pieces of paper that look blank in regular light but spell out a glowing message under a black light. "Be kinder than necessary for everyone you meet is fighting some kind of battle." Shall we?īlessed are those that are truthful.For example, if you have a fluorescent poster and shine a black light on it in a dark room, the poster will glow brightly. If you are not pleased, return for a full refund! I wish you well on all your endeavors!įine print: We value our reputation and our feedback score! Therefore, I post positive feedback right after payment is cleared,Īnd I expect you to leave a positive feedback 5 STAR RATING for me after you received your item and satisfied! All items I sell are unconditionally guaranteed Have passed USPS, eBay & Paypal security checksĪn HONEST, TRUSTED, and EXPERIENCED SELLER! All my items are legally purchased with traceabilityĪnd come from a smoke free / pet free home < □□□□ "Be kinder than necessary?" in an ebay listing? "Blessed are the truthful and honest"? Come on. Should have known from their language in their posts. Years ago, before I knew what I was doing. No Tracking Questions/Package Inquiries/Questions regarding delays at postal facilities Any images showing the above information will be removed. Image submissions should not show any personal information such as names, addresses, ACEID, phone numbers or e-mail addresses. Also be mindful of the images you post here. You are not obligated to answer customer inquiries, however, if you feel inclined to do so please be respectful. Please check out our Wiki page for more info.Įmployees: Be respectful of your fellow USPS employees and customers who may come here with a question. This is sent directly to your post office but it may take a day or two to receive a response. If you are unable to reach your post office by phone or visiting in person is not an option, you may try submitting a service request by way of e-mail. For concerns that need immediate attention it is suggested you visit your post office in person. Most problems and questions can only be answered by your local post office. Postal employees are not here to cater to customer inquiries and complaints. "The views expressed herein are my own and do not necessarily represent the views of the United States Postal Service."Ĭustomers: Please remember this subreddit is not official USPS customer service. The /r/USPS subreddit is not affiliated with the United States Postal Service. ![]()
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