Does cats urine glow in black light?
403579
many biological fluids are - urine, blood, semen
339843
All things are appear black if they are not lit.  Our eye sees black where there is an absence of light.\n\nRegarding sunlight specifically.  Look at flowers or plants in your home at night.  They don't appear black in artificial light do they?\n\nThe substance that most plants use to absorb light is called chlorophyll.  It happens to be green.  However there are lots of other things in plants that have other colours.  In the leaves they tend to be masked by the predominance of chlorophyll.\n\nAs a plant starts to die,it looses its chlorophyll and the other colours become more visible.  That is why fall leaves have different colours for different plants.\n\nAs a side note, the colour you see on an object is actually the light that is not reflected from a surface.  So something that we see as green has actually absorbed most of the red light reflecting, to your eye, only green.
724788
Absolutely...a black cat..short hair ...you are lying in bed having a sleep-in, you hear the bell of the cat as in enters the room...a small smile twitches at the corner of my mouth cos I know what is about to happen...the cat leaps landing softly on the dovet...each step compessing the down...closer and closer toward your face those paws drop, till you can hear the fast purr through you tight closed eyes...my smile broadens "here it comes"...closer now the then like a bolt of ice her cold wet nose touches your face.....I smile.
477703
The cat or the room?\nLight does not give us color. Our color was predetermined by our DNA. The light just potentiates or enhances what already is.
682859
If you could find a gas that had a semi-stable quasistate that when excited would release a photon with a wavelength corresponding to "black", then yes.  However, I don't know exactly what band that would be.  The closest you'd be able to get to black would be a dark ultraviolet, or if you could overlap in phase multiple color lasers which could possibly (but unlikely) add together to make the appearance of black.  Most likely, you're out of luck.
226800
The answer could be a yes or a no! Urine is sterile before it exits the body. As soon as it exits the body its not longer sterile because it has come into contact with bacteria from the unrinary tract and the vagina/penis (which normally have some bacteria residing in them weather harmful or not).
28214
Regular light. It is not a lazer or any special kind of light, just "light". It is probably generated by a specialized piece of equipment, but it is just light - photons. It probably doesn't contain ultra violet light like sunlight, it is probably closer to artificially created light like that from a lightbulb.
572704
Abraham Lincoln was born in a log cabin near Hodgenville, Kentucky\n\nThe luminous appearance of a cat's eyes in the dark is due to the reflection of light by the tapetum lucidum, which is part of the membranous layer between the retina and the outer covering of the pupils of the eyes. This remarkable layer is distinctly differentiated from the choroid layer only in certain animals. It is the tapetum lucidum that enables members of the feline family and other nocturnal animals to see even when there is very little light. Some authorities believe this layer reflects the light rays through the retina a second time. In the domestic cat the tapetum lucidum is brilliant green or blue in color and has a metallic luster. The well known glare is especially noticeable when artificial light is thrown on a cat in a dark corner, or when a cat in a dark place is observed through an opening, light entering the darkness through the opening being reflected from the cat's eyes as from a mirror.\n\n\nShumilikha\n\nMales do not sting
564158
All natural light sources generate a "spectrum" of frequencies that approaches the "black body" radiation curve. The peak of that curve denotes the temperature of the emitting object. Certain frequencies can be affected in transit via interaction with materials as in emission and reflection nebula (ie. various places within the Orion constellation). The sun emits UV radiation commensurate with its black body ideal.\n\nUNLESS someone can show that the moon absorbes ALL UV frequencies on reflection then by definition:\n\nMOONLIGHT DOES INDEED CONTAIN UV FREQUENCIES\n\n===============================================\nSome of you people amaze me, you answer questions that you know NOTHING about. Answers like "No because it is reflected light" are a case in point. Is your blue shirt invisible in the mirror because the light coming from your shirt is lost as it reflects off of the mirror. I THINK NOT! Reflected light IS LIGHT. Some of it is absorbed, reflected, refracted but it is light. YES; the UV portion in moonlight is very weak, hey guess what -ALL THE LIGHT frequencies in moonlight are weak; THATS WHY MOONLIGHT IS DIM.\n==============================\nUV is NOT produced only from objects above 24000 degrees. It is produced at ALL temperatures, but the lower the temperature the lower the amount of UV that is produced. PLEASE Google "black body radiation"
1052517
The color of pee is caused by bile, a chemical the liver produces to break up fat. When our bodies break down bile, the pigment urochrome turns pee yellow. The lighter the color, the more liquid has watered it down. \n\nIn fact, you can easily determine if you're dehydrated from the color of your urine. Dark yellow is a symptom of moderate dehydration and is a sign that you should drink fluids right away. However, taking vitamin supplements can also cause pee to appear yellow. \n\nBelieve it or not, urine's yellow color was once believed to come from gold. Long ago, alchemists attempted to extract gold from pee. Needless to say, they were unsuccessful. However, in 1669, an alchemist named Hennig Brand discovered phosphorus while engaged in the undertaking. Among other things, this find helped to spark the creation of matches. \n\nYou may have asked this question lightheartedly, but for hikers and parents of small children, understanding the significance is important for health and safety.
535775
Without going into the complexities of molecular theory, things APPEAR black because they absorb many wavelengths of visible light/EM radiation including infrared (heat) thus making them hotter.  Because everything is absorbed, no light is reflected and you see no light or darkness/black.  The excess absorbed energy manifests itself in many ways such as adding to the vibration of the molecules or heat.\n\nWITH slightly more detailed quantum theory:\n\nThe energy is absorbed by the electrons of the atoms that make up the black material and excite them from a ground level to a higher level or energy state.   From quantum mechanics, we know that these electrons will only absorb light of a given frequency/energy - that which corresponds to just enough energy to go from level 1 to level 2 to level 3 and so on - and will not absorb other frequencies (hence why we have red - green & blue absorption, etc).  In these black materials it just happens that the differences between all the energy states correspond to most frequencies of visible light giving you dark/black colours or full absorption.  At higher energy states, the atoms and molecules have extra energy which allows them to vibrate more or become hotter.  They're also less stable and reemit this energy in the form of infrared (heat) to get back to the more stable low energy state.
496562
All of these other answers are wrong.  The yellow pigmentation in urine is called urobilin.  When red blood cells die, the heme is converted to bilirubin by the spleen, which is converted to urobilinogen by the liver, which is then converted to urobilin by the kidneys and gives the yellow color of urine.  Urobilinogen can also go into the colon and be converted to stercobilin by the bacteria of the colon, which is what makes poo brown.
6778
A black light emits light in the ultraviolet range with a wavelength not visible to the naked eye; thus black light (yes, the lamp filament may also emit a visable glow).\n\nWhen ultraviolet light photons (which have a very short energetic and penetrating wave length - where X-rays are even shorter and more penetrating) strike the surface of certain materials, electrons absorb the photon's energy and are knocked out of their low energy electron shells to higher energy shells.  When the electrons fall back to lower energy states, the absorbed energy is released emitting a characteristic phosphoresence color.  This often can be used to identify certain minerals that exhibit crystaline structure.
625983
Real amber:\n\n--should easily generate a static charge if you rub against a fabric\n\n--will glow under black light\n\n--will give off a piney-type smell over a flame, as mentioned earlier
956889
Oh dear!!! I have lots of cats and they have hats and scarves on!! In a weird green colour,they look nuts!!! It makes my kids laugh every time I turn it on.
1066240
I think most people look, but most people don't know what it means to have dark or light pee. But I KNEW!!! YAY FOR ME!\n\nMines clear!   water, water, water! Oh...and power-aid!
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It's all about night vision.\n\nThe amount of light refracted in a cat's eye is much higher than ours.\n\nIn a dark room, the smallest amount of light will be bounced off the retina in the cats eye, to us all is dark and there is no light.\n\nJust like a dog being able to hear sounds that are above the sound frequencies that we can hear.\n\nHope this helps!