Talk:Blacklight

message: I realise of course that the two subjects aren't the same  (as I hope the merged article indicated), but as they're related it's surely better to have one decent article than two very short ones that are unlikely to be expanded?  Redirects ensure that readers find what they're looking for. --Mel Etitis  (Μελ Ετητης) 08:43, 2 April 2006 (UTC)
replies: text: I disagree with your prediction that these articles are "are unlikely to be expanded". However, if I'm wrong, and neither one of these articles has been expanded in the next year, then I would remove my objection to their merger. --Arcadian 12:57, 2 April 2006 (UTC)
replies: text: I have to disagree with merger of these two pages for the simple reason that the categories that they are in cannot be easily joined. --DV8 2XL 13:02, 2 April 2006 (UTC)
thread_title: Merge

message: Hi just noticed you omitted a word: "become".  I changed your opening sentence from  "will fluoresce pink" to "will become fluorescent pink" :) .--ToasterCoster (talk) 20:27, 1 July 2009 (UTC)
thread_title: Become

message: Vidamin A or D?
84.228.1.79 (talk) 04:28, 20 October 2010 (UTC)
thread_title: "UVA can also destroy vitamin A in the skin."

message: Chameleon Tattoo pink
no  — Preceding unsigned comment added by 2601:340:4200:310F:7945:C955:B99E:F458 (talk) 00:13, 15 December 2015 (UTC)
thread_title: Black light tattoos

message: how was black light produced, who produced black light, when was black light made.'''
Wood's light and Black light seem to be two names to refer to the same thing. Should the article named Wood's light be merged into this one ? 16@r 10:57, 11 March 2006 (UTC)
thread_title: merger

message: Isn't prolonged exposure to UV light dangerous? I heard someone saying that they wanted to purchase a blacklight but the warnings scared them off.
:no one knows the extent of such an effect of being exposed to blacklights. but I would doubt it is that serious. after all, if you're not even getting a suntan from your exposure how bad could it be. --Deglr6328 18:04, 16 September 2006 (UTC)
replies: text: Perhaps a section should be added to discuss this?--HoneymaneHeghlu meH QaQ jajvam 01:11, 21 December 2006 (UTC)
replies: text: If there are citations, go for it but otherwise we'd just be speculating.--Deglr6328 07:14, 21 December 2006 (UTC)
thread_title:  Cancer 

message: I believe I did get a burn on my exposed skin (especially on sensitive skin such as lips) over the course of 4-5 hours in a large nightclub with intense blacklight throughout.  I spent no time in the sun that day but felt discomfort in the club after several hours, and the next morning I clearly was burned somewhat.  Perhaps their lights had defective phosphor or were not properly chosen for the application?  Perhaps they mixed in some botanical or tanning bulbs by mistake?  There was no visible difference among the bulbs, however, as far as I can remember.  (Unfortunately we will never know for sure.  The building was utterly obliterated by a hurricane.)
Can anyone comment on this please?  How about a link to authoritative research on the topic, such as a Medline journal abstract.
--Parsiferon (talk) 07:50, 17 February 2008 (UTC)
thread_title:  Skin burns from prolonged exposure 

message: The article says "Black light testing is commonly used to authenticate antiques and banknotes." My question is how?  I have a black light pen for this purpose, but I'm not sure what I'm looking for. Please add your answer to the article. --DBlomgren 03:35, 22 January 2007 (UTC)
replies: text: I have added a pic as an example. If your bills look different, either your euros are wrong or your lamp is different. My (well, Commons') 5000 Euro cents. --84.20.17.84 09:08, 3 July 2007 (UTC)
replies: text: Many banknotes have security features printed in ink which is invisible in white light, but brightly fluorescent, often in pale green under UV. In the UK, depending on the issuing bank, these may be bars, numbers, or features in the pictures themselves. The driving licence card also has "invisible" features which appear to be embossed holograms over the card.82.6.1.85 (talk) 01:08, 10 December 2009 (UTC)
thread_title:  How used to authenticate banknotes 

message: yea, i know this is completely not even a major issue, but i've looked on every search engine and cant find anything, but are there such things as 96" blacklights, and if there are, can someone please tell me where i can get some? and if they don't im curious as to why they don't. —The preceding unsigned comment was added by 166.82.242.104 (talk) 01:15, 27 February 2007 (UTC)
thread_title:  places to buy 

message: It would be helpful to annotate the spectral diagram with the visible spectrum colors, and names of non-visible segments. -- Beland 00:33, 11 June 2007 (UTC)
thread_title: Diagram

message: A google search will turn up many examples of anecdotal evidence that semen will fluoresce under a black light, but I have been unable to find a verifiable source that it does. This article is a scientific study trying 29 different semen samples, and they could not get it to "glow" under any circumstances. The theory is maybe semen does not glow but has been confused with other substances in the past...
http://pediatrics.aappublications.org/cgi/content/full/104/6/1342
Similarly for blood. The closest thing I've found that deals with blood and black lights said that blood becomes darker than its background (link). Admittedly, that one's an ad, but a search for "UV and blood" and "blood fluorescence" doesn't provide many results. The former returns references to a spray that makes blood fluoresce (most likely luminol), while the second returns several studies relating to fluorescence of blood with living cells, which wouldn't be the case if blood is spilled (as in a homicide). Can anyone explain?
StoicalSoul (talk) 04:04, 18 March 2008 (UTC)
thread_title: Does semen really fluoresce under a black light?

message: A black light can make images "glow", but can it make invisible images visible (can I draw a picture on my wall that you can only see when I turn on a black light), or can it make, as questioned above, invisible stains visible? - 121.208.89.240 (talk) 08:39, 19 July 2009 (UTC)
thread_title: Invisible

message: Richard asr (talk) 19:20, 22 September 2010 (UTC)
thread_title:  Copyedited 

message: TV always goes on how they detect semen but I could find no reference in the article.  Is it untrue?  Are you ready for IPv6? (talk) 05:03, 19 December 2010 (UTC)
thread_title:  Semen 

message: Is there a better NON-NUDE image that could be used in this article?  —Preceding unsigned comment added by 70.16.243.110 (talk) 14:23, 2 February 2011 (UTC)
replies: text: It's hard to find images of scorpions wearing clothes, at least images that have a GFDL license. --Wtshymanski (talk) 18:57, 9 March 2011 (UTC)
replies: text: LOL. I think he was talking about the Beo Beyond costume. Negativecharge (talk) 14:36, 10 May 2011 (UTC)
thread_title:  Image 

message: Why do blacklights always look purple? I understand that Wood's glass passes red and blue making purple... is that it? Is it that Wood's glass is just the least expensive UV filter? UV LEDs seem to also look purple... Is it that cone cells for red have more blue response than green ones? Maybe a better question for Talk:Violet (color)? —Ben FrantzDale (talk) 15:32, 9 March 2011 (UTC)
replies: text: Me too. I bought some LEDs that claim to give off 380 nm near-ultraviolet.  They look pretty bright - am I just seeing the spillover (other wavelengths), or does the eye still have useful sensitivity at 380 nm, even though the curves show the response getting pretty close to 0. The LED is definitely making some kind of UV because I can see the threads and dots light up in banknotes, but I didn't expect to see so much visible light from it. IR LEDs don't ever do this, for example.  --Wtshymanski (talk) 22:53, 9 March 2011 (UTC)
replies: text:  The page about Wood's glass says that is blocks almost all visible light except a little violet/blue and red, so the color must be a result of the waves mixing and stimulating the cones. Negativecharge (talk) 20:29, 17 July 2011 (UTC)
replies: text:  I once read that purple is not a spectral color. It was defined as the visual sensation created by viewing a mixture of violet and red light. I suspect that some black light filters pass long-wavelength red light. Regards, Nikevich 21:26, 6 July 2012 (UTC)
replies: text: The purple from a fluorescent black light tube is the remnant of mercury's 404 nm spectral line that escapes the filter material.  UV LEDs have a broad emission that includes significant visible purple light in the 400 nm range. --ChetvornoTALK 21:14, 16 January 2013 (UTC)
thread_title:  Why purple? 

message: A fun factoid this article keeps getting wrong; the dark filter material in the tubes of fluorescent and other black light bulbs is not Wood's glass   1,  2,     3,    4,      5,    6,    7.    Wood's glass, the nickel-doped glass invented by physicist Robert Williams Wood around 1903 that was the original UV filter, is not suitable for making light bulbs; it has a large temperature coefficient, is not mechanically strong, and it also reacts with moisture in the air to form a layer of hydroxide.  I believe BLB black light bulbs are made with a (dichroic?) filter coating on an ordinary glass or quartz bulb.  Although Wood's glass is expensive and has the above drawbacks, it apparently is a better UV filter than the alternatives used on bulbs; it has a sharper cutoff so it removes more of the visible light for a given amount of UV passed,  8 so there is less visible light to interfere with viewing fluorescence effects.  Therefore it is still used in the form of separate glass filters in high end black lights for medical and scientific use.    
Unfortunately, it is hard to find this out; most websites and even books get this wrong and simply call the BLB filter material "Wood's glass".   If anyone can find a better source for this than the secondary sources above, I would appreciate hearing about it.  I had a good source but it disappeared.  --ChetvornoTALK 20:56, 16 January 2013 (UTC)
replies: text: thanks for your explanation. I believe that belief that the glass is made if wood's glass is commonly held and I have added a reference from San Jose State University's page supporting it. If you know what it is made of, then its easier to search it, but with "I don't know what it is, but I know its not woods glass" wouldn't help us verify it. The links you provided are not reliable and does not really mean much, because there is no oversight over what is written, or the authors' expertise. Cantaloupe2 (talk) 12:18, 22 January 2013 (UTC)
replies: text: I understand your skepticism; these references are not the best, but I don't think they are without credibility (this one    6 is a commercial lighting vendor's data page).  And it seems plausible that there are other filter materials that lighting manufacturers have found preferable to a glass formulated in 1903 with the above weaknesses.  It seems to me that these references collectively cast enough doubt on the use of Wood's glass in bulbs that the article should hold off making this claim.  Many RSs simply refer to it as a "dark filter material".  --ChetvornoTALK 19:35, 22 January 2013 (UTC)
replies: text: Glowinc is only an web retailer. If it was from a manufacturer's website, I agree that it is a WP:RS. The difference is night and day. It's like asking a clerk at a store vs looking at a written material from the product's manufacturerCantaloupe2 (talk) 00:31, 23 January 2013 (UTC)
thread_title:  Black light bulbs don't use Wood's glass 

message: This weekend I encountered an indoor mini-golf course that had lots of black light artwork and gave the patrons special glasses (I'm guessing a micro diffraction grating? But there seemed to be no rainbow-prism effect) that induced a 3D effect in some of the pictures.  Anyone have sources that explain the effect?  Here's a Google search showing that there seem to be a lot of these places out there.  When I held the glasses out in front of me, it looked like both left & right lenses bent light toward the center of vision, but I couldn't tell whether the effect was greater for different colors.  Kenahoo (talk) 03:41, 9 March 2015 (UTC)
thread_title:  3-D Effect with Glasses 

message: Under U.S. Type, there are different tubes with different specifications given as "BL," "BLB," ("BL"), and ("BLB"). Does anyone know what the rationale and/or historic reason for the duplicate designations? How does one tell whether a tube marked BLB is one BLB versus another? Ngchen (talk) 22:07, 30 April 2013 (UTC)
replies: text: See the sections on Fluorescent and "Bug zapper" tubes.  --ChetvornoTALK 08:18, 9 March 2015 (UTC)
thread_title:  U.S. Type 

message: Hello fellow Wikipedians,
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thread_title:  External links modified 

message: Visual ultraviolet effects are extensively used in theatre, theme parks and themed entertainment generally.  These effects are commonly referred to in aggregate as "blacklight effects".  This is not slang, but common industry usage.  The "gold standard" supplier of many of these effects for entertainment has been Wildfire Lighting & Visual Effects (since 1989), who manufacture fixtures, lamps and paint and other stagecraft materials.  See http://www.wildfirefx.com/.  There are other manufacturers, such as Altman Stage Lighting, http://www.altmanlighting.com/product-category/blklights/, as well as suppliers such as Rosco, who make an extensive line of color filters, both plastic and glass, as well as their own fixtures http://www.rosco.com/.  Rosco is particularly useful because they publish the transmission curves of their products.  I bring this to your attention, as the coverage of this use is pretty light in the article.  Given time, I may return and write something, but if this makes anyone curious in the meantime, please proceed.  Oddjob84 (talk) 21:56, 30 June 2017 (UTC)
thread_title:  Blacklight Use in Entertainment 

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thread_title:  External links modified 

message: Spectral properties of the UV lamp are its crucial parameters. I suggest the article should contain a plot of a detailed blacklight lamp spectrum, as depicted in the figure here. The figure that is presently in the article lacks details due to non-logarithmic vertical scale and probably neglects emission lines of mecury vapour. Unfortunately the addition of the new image was reverted. --FDominec (talk) 12:14, 4 October 2019 (UTC)
thread_title:  Detailed spectrum of a blacklight lamp 

message: Article says (section 'Types', subsection 'LED'):
The marked text may no longer be true (apart from the linguistic mistake), as can be seen from a simple search of 'UV led spectrum'.
random examples:
* https://www.reef2reef.com/threads/somedays-im-amazed-at-whats-hidden-out-there-uv-cobs.701059/
* http://www.nitride.co.jp/english/products/lamp.html
However, the subsection text becomes trivial without this.
I am new here, so I don't know what would be the preferred way to fix this.
--Rjxt8 (talk) 14:41, 29 August 2021 (UTC)
thread_title:  Types: LED