Processing evidence for latent fingerprint impressions by using cyanoacrylate in a vacuum environment reduces the atmospheric pressure and allows the glue to develop latent prints on items of different sizes and shapes, and penetrates inside plastic bags and small crevices. Processing in a vacuum will eliminate the background noise and allow the cyanoacrylate to attach to the latent print residue while eliminating over development of the evidence.
A way to test CA Vacuum Chambers is with a test print on tin foil, place it in a tape sealed plastic baggie, and place the baggie into a tape sealed paper envelope. The test print will develop within 30 minutes. For an example, take a stack of 100 CD's, place a print on both sides, leave them stacked and every print will develop on both sides within 30 minutes.
There is no heat source and no need to separate, un stack, open, remove, or un bunch items prior to processing with superglue under vacuum. Superglue vapors pass through sealed plasticbags, paper bags, and sealed cardboard boxes.
Superglue under vacuum is in a way the same concept as when Latent Print Examiners started using an oven instead of an iron when processing with DFO and Ninhydrin.
No need to separate items such as: