Why do objects (rocks, wood, paper) get darker when wet?
553775
The reason for it to get darker is because when it absorbes water it fills up little micoscopics air caveties and ones is does this it absorbes more light, therefor it looks darker. (is doen't change its color, just looks like it)
641033
Look for water mark images by holding up to the light.  Look for plastic strip. Look for color changing ink,etc.
765881
The liquid should be clear...litmus paper is white usually...turns pink to red when in an unbalanced PH soulution....Yukoneze
389551
Depends... If by darker you mean that when looking at that Bay of Bengal from land its lighter than the Arabian sea, then its most likely a difference in depth.  Deeper water usually appears darker than shallower water.  Or it could be due to Vegetation on the floor of the Arabian Sea and not the Bay of Bengal.  Kelp and Sea plants generally make the water appear darker also.  \n\nThe key is appear.  If you took a glass of Bay of bengal water and a glass of Arabian Sea water and set them side by side They should be the same color.  If they were not the same in color, then it must be a pollutant or plankton.
695688
black or dark colors because it's harder to notice scratches and dirt
524389
Two things could cause this. One is simply that your monitor brightness is slightly off or, more likely, the JPEG quality settings in photoshop are set to darken the image slightly when saving.
563599
The answer would depend on the color to the samples.  Since dark colors absorp(Suck in) heat easier, black dirt would be warmer than tan sand if the were both in the same temperature and sun
145721
water.  soil is dark which means it absorbs heat.?
337135
It is because of the air bending the light slightly. Its the same as shining a light through water, but the effects are less pronounced.
620535
Because of the nature of light energy, wave or particle. When clothes are wet, water fills the spaces between the fibers and forms a thin film on the surface. This diffuses light striking the clothes and also absorbs some of the energy, so less light is reflected. THt energy goes into heating the water, which is why your clothes will dry in the sunlight.
1005699
The same thing that causes prizms in crystals.  It is the colors of light, the rain condenses them just as the crystal does
468375
Two solutions that you will find in any home, tea and coffee. They should do the job nicely.\nThe longer you leave it in the fluid, the darker it will become, so check it often.
1114808
Water refracts light, which changes the appearance of gthings in it.\nTake a stick, and poke it into a bath of water at a 45 degree angle.\nLook at the stick from an angle, and you will see a serious "kink" in the stick, when you know it is straight.
398003
Because if absorbs more light wet than dry.
808478
Whilst still below the surface it is called magma. Rocks which from from magma which has not been extruded at the surface cool more slowly (as they are at greater depth and hence higher temperatures) and thus have time to grow larger crystals before solidifying, producing a coarse-grained texture. These rocks are referred to as 'plutonic' and include gabbros, diorites, and good old granite. (You'll notice gabbros are darker due to their higher content of iron, etc - where as granites are a lighter colour as they are more rich in silica).\n\nLiquid rock at the surface is referred to as lava, and cools to form volcanic rocks such as basalts, andesites, and rhyolites (and obsidian, which is a really cool black volcanic glass). Due to cooling faster, volcanic rocks are quite fine-grained: if you look at a granite, you'll see indiviual crystals of the minerals (those little black or shiny silver-ish specks, or the large-ish pink or white crystals of feldspar) whereas to the naked eye, a volcanic rock such as basalt often looks rather like just a grey rock! (Looks pretty wicked under the polarizing microscope though...!)
208500
Perhaps the plants transpiration processes of; photosynthesis, CO2, & nitrogen along with other conditions, ie. H2O temp., Ph level, UV length of intensity play a part of the chemical transformation of plant material to become reddish in color.  Ideally, a micro nutrient of Fe (iron) would make a difference but not certain.
776710
they make colors usually white stand out more. if you have glow in the dark stuff it will make that stand out too