Test Tube with Solid Sample - Science Lab Illustration #222209 (License: Personal Use)

This black-and-white sketch depicts a standard cylindrical glass test tube, angled diagonally, with a visible meniscus line and a pile of dark granular solid occupying the lower third. The illustration emphasizes clarity and simplicity, typical of textbook diagrams for teaching basic laboratory procedures. It conveys the concept of solid-phase containment in analytical or preparatory chemistry contexts.

Used in educational websites, science textbooks, or lab procedure guides to illustrate sample handling, solid reagent storage, or introductory chemistry concepts; matches user intent for visual learning or instructional material.