What should always be used inside a fuming cabinet for latent print development?

Using a fuming cabinet for latent print development is essential for ensuring that the chemical vapors are contained and that the process is conducted safely and effectively. The correct choice states that all of the techniques mentioned can be used inside a fuming cabinet, highlighting the versatility of the environment for various latent print development methods.

Superglue fuming, also known as cyanoacrylate fuming, is a widely used technique that produces white, permanent prints on non-porous surfaces. This method works well in a fuming cabinet since the enclosed space allows the vapors to circulate and adhere to the moisture in the latent prints, thereby enhancing visibility.

Ninhydrin is another effective technique for developing prints, particularly on porous surfaces such as paper. It reacts with amino acids present in the sweat left behind in the latent print, producing a colored print. Using ninhydrin in a fuming cabinet ensures that the chemical is contained, preventing any excess fumes from dispersing into the work area, which could pose safety risks.

Physical developer is a technique typically employed to develop prints from porous surfaces that may have been wet at some point. It works by enhancing prints with silver nitrate. The fuming cabinet provides an ideal environment for controlling the application of