because the grease contains fat. rubbing a food/object is a way of testing for fat.
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Grease is a hydrophobic substance, meaning it repels water. When grease is applied to paper, it displaces the air within the paper fibers, reducing the light-scattering effect and making the paper more translucent. This effect is due to the change in the refractive index of the paper caused by the presence of grease.
To make paper translucent, you can use a process called waxing. Simply melt some wax and brush it onto the paper, allowing it to dry and creating a semi-translucent effect. Another option is to use oils or varnishes to create a similar effect.
Grease paper is a type of paper that has been treated with a thin layer of greaseproofing to make it resistant to grease and oil. It is commonly used in baking and cooking to prevent food from sticking to surfaces.
Tracing paper is thin, translucent paper used for tracing images or designs, while wax paper is paper coated with a thin layer of wax on both sides, making it grease and moisture resistant, often used in baking or food storage. Tracing paper is typically used for artistic purposes, while wax paper is more utilitarian in its applications.
Kerosene has a lower refractive index than paper, causing light to bend less when passing through the paper. This difference in refractive index reduces light scattering, making the paper appear translucent by allowing more light to pass through without being reflected.
When oil is placed on brown paper, it can make the paper translucent or translucent due to its ability to seep through and saturate the paper fibers. The paper may become greasy or oily to the touch, and it may leave a stain or mark on the paper surface. Over time, the oil may cause the paper to become wrinkled or discolored as it dries.