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SIRCHIE recommends the use of a controlled test prior to using any powder or
chemical development. When using powders, place a test print on the surface
in an area not likely to have been touched by the suspect. For chemical
development, place test prints on a control surface such as a reversible backing
card and include this control in the development process.

Note: Many of the following powders and chemicals will interfere with subsequent testing
of physiological fluids such as blood, seminal fluid, saliva, and urine, and with analysis for
handwriting and ink identification on questioned documents. Collection of these forms of
physical evidence should be completed before latent print development is undertaken.

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