heat-sealable bag

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Tea bag — A tea bag is a small, porous paper, silk or nylon sealed bag containing tea leaves for brewing tea. The bag contains the tea leaves while the tea is brewed, making it easier to dispose of the leaves, and performing the same function as a tea… … Wikipedia
Trace evidence — contends that every contact, no matter how slight, will leave a trace. The trace is normally caused by objects or substances contacting one another, and leaving a minute sample on the contact surfaces. Material is often transferred by heat… … Wikipedia
sample preparation — ▪ chemistry Introduction in analytical chemistry (chemistry), the processes in which a representative piece of material is extracted from a larger amount and readied for analysis. Sampling and sample preparation have a unique meaning and special … Universalium

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