Lipids are hydrophobic molecules that do not mix well with water. When a lipid comes into contact with brown paper, the paper absorbs the lipid from the solution because both are nonpolar substances. This results in a translucent stain as the lipid molecules are deposited on the paper, creating a semi-transparent appearance.
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.
In food science this test is used to determine if a substance is fat or not. It is a crude test but it works in a pinch. Rubbing the unknown substance on the brown paper bag if fat is present the bag will get translucent. If it is water based it just gets wet.
with a piece of paper
You will only need one tree to make a brown paper bag. Just one tree will make several paper bags.
the glass was so translucent that you could see through it
Yes ,take a paper bag the flap draw or print out her head then you draw the body on the rest of the bag that is how you make a paper hand puppet.
Testing for fats involves rubbing the solid against a white or brown paper bag. If the solid is fat, it will turn the paper translucent else, the paper will be wet or maintain its original state.
Because the oil, or lipid, from a certain substance or food is showing through the thin material of a paper bag. When it shows through, it means it has lipids in a certain food or substance.
Sudan red can be used to test for lipids. It is soluble in lipids so it will turn the entire sample red. Also, you can do the brown paper test. Put a few drops of the suspected lipid onto a brown paper bag. If the substance is a lipid, it will turn the spots translucent.
tracing paper , any coloured glass bottle , wax paper , plastic bag , frosted glass , capiz shell , sunglasses , ice cube!
aviod plastic use paper bags