because it contains lipids
Grease spots in lipids are due to the hydrophobic nature of lipids, which allows them to repel water and form greasy spots. Lipids have long hydrocarbon chains that are nonpolar and interact with each other more than with water, leading to the formation of these greasy spots.
Flies leave black dots behind when they fly because they excrete waste as they move, which can appear as small droplets or spots on surfaces.
The principle behind the removal of grease spots by organic solvents is based on the solubility of grease in non-polar substances. Organic solvents, such as acetone or alcohol, have non-polar characteristics that allow them to effectively dissolve and lift oils and greases, which are also non-polar. When the solvent is applied to the grease spot, it breaks the intermolecular forces holding the grease together, allowing it to be wiped away easily. This process relies on the "like dissolves like" principle, where similar polarities facilitate the dissolution.
Any foods that are not packed with fat or grease
Brown spots on the wall from flies could be caused by their feces or regurgitated food. Flies often leave behind these spots as they move around and feed on surfaces. Regular cleaning and proper sanitation can help prevent this issue.
Assuming grease spots on clothing: Cover the grease spots with a stain remover (like Vanish sticks or something else that targets the stain directly), then put the item on a really hot was with a double amount of laundry detergent (if it's safe to do so according to the packet instructions). You may need to put the item in for an extra long wash.
Flies leave black spots because they excrete waste as they feed on food or other surfaces. These spots are a mixture of their waste and the food they have consumed.
The Cheetah Girls Behind the Spots - 2004 V is rated/received certificates of: USA:E
Another simple test to determine if a molecule is a lipid or not is the grease spot test. Lipids leave a translucent spot on paper when they absorb into it due to their hydrophobic nature. This test can help differentiate lipids from other biomolecules that do not leave such spots.
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Dan Newnhams behind
Flies leave brown spots on surfaces because they regurgitate and defecate while feeding, which can contain digestive enzymes that cause discoloration.