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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.
What else can I help you with?
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 recover geothermal energy?
After drilling into the Earth to the heat, it is used to turn water to steam, to turn a turbine.
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.......
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 is alcaptonuria?
Alkaptonuria is an inherited condition that causes urine to turn black when exposed to air.
Why do tulsi leaves turn black?
Tulsi leaves turn black due to oxidation, which occurs when the leaves are exposed to air for a prolonged period of time. This process causes the leaves to lose their green color and turn black.
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 causes tincture of iodine to turn black?
Tincture of iodine turns black when exposed to excessive heat or light, which leads to the breakdown of iodine molecules, resulting in the formation of iodine vapor. This vapor combines with water molecules to create a black complex known as iodine pentoxide, which gives the solution its black color.
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 did the basil turn black in the fridge?
The basil turned black in the fridge due to oxidation, which occurs when the herb is exposed to air for an extended period of time.
Does silver turn black in bleach?
Yes, silver can turn black when exposed to bleach due to a chemical reaction with sulfides present in the environment. This black tarnish can be removed using appropriate silver polish or cleaning methods.
Why does black underwear turn brown?
Black underwear may appear to turn brown due to a variety of factors such as wear and tear, friction from washing or wearing, and exposure to heat and sunlight. Over time, the dye in the fabric can fade or change color, leading to the perception of the underwear turning brown.
Why do basil leaves turn black?
Basil leaves turn black due to a chemical reaction that occurs when they are exposed to air for a prolonged period of time. This reaction, known as oxidation, causes the leaves to darken in color.
