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Paper reciepts that turn black ( or blank ) are due to the use of thermal print technology, where the printer exposes the paper to heat to generate the printed letter or number. As this requires the use of thermaly sensitive paper, any subsequent heat from something such as sunlight ( on a reciept left on the dash of a car) will over time turn it black or in the case of being in a wallet, cause the paper to lose its printing( due to constant lower heat causing the chemically treated paper to lose its sensitivity), . It has been suggested that stores use this technology on purpose, in that by the reciept becoming no longer readable...they have less returns.
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∙ 13y ago
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When Litmus paper is place in rainwater what color will the litmus paper turn?
in neutral conditions there is no change in colour of litmus....
What is an hypothesis for cutting an apple?
Hypothesis 1: When you disturb the skin of an apple by cutting the apple into half, the exposed area will turn brown due to exposure to air.Hypothesis 2: If you snugly wrap or cover the exposed area of an apple after cutting it (disturbing the skin), you can slow down how fast the inside turns brown. Hypothesis 3: If you remove all of the skin of an apple and let it sit in the air, the outside will turn brown but the inside will not turn brown at the same rate. Hypothesis 4: If you remove all the skin of an apple AND slice the whole apple into pieces, all sides exposed to air will turn brown; if some slices are thicker, the inside will turn brown more slowly than the exposed outside areas.
What turns solids in to liquid?
Solids turn into liquids when you melt or heat- up the substance for a curtian amount of time. If you boil or 'heat up' the substance for too long than it may turn into a gas.
How do you turn ice into steam?
Heat it.... The heat will first convert ice into water and will then convert it into steam. You can heat ice in any kettle.....or saucepan.......
How do you recover geothermal energy?
After drilling into the Earth to the heat, it is used to turn water to steam, to turn a turbine.
What happens when silver nitrate exposed to light?
It turns black or dark in colour when silver nitrate is exposed to sunlight.
Why do bananas turn black when peeled?
because exposed to air and rotts
What happens when silver halides are exposed to light or radiation?
They turn black
What type of rock would granite turn into if exposed to heat and pressure?
metamorphic rockgneiss
What is alcaptonuria?
Alkaptonuria is an inherited condition that causes urine to turn black when exposed to air.
What metal goes black in the air?
copper,and some precious metals, when exposed to air, turn black, like silver(completely turns black when exposed to air),gold(black spots appear),and others,maybe platinum.
Why does black underwear turn brown?
Often black dyes will turn brown when exposed to bleaching products. The underwear was probably bleached. OR You pooped your pants too often
How would Sedimentary rock turn to metamorphic?
Sedimentary rock that is exposed to heat and pressure will be changed to (metamophised) into metamorphic rock. This is often associated with volcanic activity. An example is limestone, when exposed to the pressure and heat can be changed to marble.
What will happen if a sedmentary rock is exposed to heat and pressure?
It, like any rock, would turn into a Metamorphic rock.
Are Yukon Gold potatoes genetically modified so their exposed surfaces to not turn black in oxygen?
yes
What does carbon turn into if exposed to oxygen?
Nothing, unless there is a heat source. Then the carbon reacts to form carbon dioxide. C + O2 ---> CO2
How obsidian rocks form?
They are formed when either a sedimentary rock or a metamorphic rock are exposed to high heat and turn into magma and then cool quickly.
