Where should a pure ignitable liquid sample never be placed?

A pure ignitable liquid sample should never be placed in a metal can due to the risk of chemical reactions and reactivity that can occur with certain substances, particularly if there is a likelihood of corrosion or if the metal can is not inert concerning the ignitable liquid. Metal containers can also conduct electricity and heat, which could create a fire hazard under certain conditions.

In addition, placing ignitable liquids in a metal can could compromise the integrity of the sample, as the interaction with the metal can alter the chemical properties of the liquid. This is especially relevant in fire investigations where the purity and original state of samples are crucial for accurate analysis.

Other containers, such as glass jars or appropriate plastic containers, are generally preferred for storing ignitable liquids, as they can minimize potential reactions and safely contain the sample. An open-air environment is not suitable either, as it exposes the sample to air and potential sources of ignition, but the specific concern with metal cans makes them the least appropriate choice.