Scientific Vial Illustration Showing Progressive Sample Quantities #304443 (License: Personal Use)

This black-and-white engraved illustration shows three identical cylindrical glass vials with ground-glass necks and cork stoppers, arranged side by side. The left vial contains a small deposit at the base, the middle holds roughly half its volume in fine dark granules, and the right is nearly full-suggesting a controlled experiment or dosage progression. The style evokes 19th- or early-20th-century scientific textbooks or pharmacopeia illustrations.

Commonly used in educational science content, chemistry lab guides, historical medicine references, or infographics illustrating concentration gradients, titration steps, or sample preparation. Matches user intent for visual explanation of quantitative change in contained substances.