How should a brush be used when applying fingerprint powder?

Using a brush with light strokes when applying fingerprint powder is the most effective method for preserving the delicate integrity of the fingerprint ridges. Light strokes allow for the powder to adhere to the oils and residues left by the fingers without the risk of smudging or destroying the print itself. This technique minimizes the chance of damaging the fingerprint's detail and makes it easier to lift a clear impression later on.

Additionally, using light strokes helps to ensure that the powder isn't applied too thickly, which can obscure finer details of the print. This approach is essential in forensic practices, where clarity and accuracy are crucial for analysis.

While other methods, like using a heavy hand, tapping firmly, or employing vigorous circular motions, may create issues such as smudging or losing critical fingerprint detail, light strokes facilitate a gentle and careful application of the fingerprint powder, making it the preferred technique among forensic professionals.