Why does scattering the powder of aluminum on things can help recognize fingerprint?
you can hold a piece of bread in front of a fire to toast it (held on a fork) or use a grill.
spread butter on the bread and put in skillet to brown/toast with a medheat.I love it this way :)
Step 1- Go to the WW2 museam Step 2- Steal a flamethrower Step 3- ?? Step 4- Profit.
Turn your element on high and hold a slice of bread over it until it toasts with a pair of oven tongs.
When you touch a surface, the oils from your skin leave behind an oily residueCertain powders will naturally adhere to the residue, and they are sprinkled or brushed onto the surfaceMagnetic application of some powders is used in highly sensitive situations, where the oil might be otherwise brushed away in the processIf the suspect's fingerprint contains no oil, then some powders are sensitive to amino acids left behindThere are several factors influencing the effectiveness of fingerprint powdersThere are many different types of fingerprint powder, and aluminum powder is the most commonPowders are classified using the following characteristics: Fineness: The powder must be fine enough to show the detail of the fingerprintFiner powders would be theoretically capable of displaying greater detail than coarser powders Adhesion: The powder must display the right level of adhesion, so that it will adhere to the residue of the fingerprint (often oils) and not adhere to the rest of the surface where it would obscure the view of the printWhen a powder coats a surface, this is known as 'painting' Sensitivity: Sensitivity is related to adhesion, and is how well the powder adheres to a surfaceFor example, aluminum flake is more sensitive than aluminum powder, but greater sensitivity is not always desirable Color: The fingerprint powder must be a suitable color for the surface in questionFlow: To a lesser extent, it is important that the powder can flow, and does not 'cake' into a solid block, which would render it useless.
