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Difficulty 3 · Long soak 3 cards

Runs over hours or days, or needs a thermometer.

Isometric glassware cross-section for difficulty 3: liquid height tracks difficulty and bubble count tracks run time

Separating Leaf Pigments on a Coffee Filter

Long soak · bench date 13 Oct 2026

Difficulty 3/5 50 min Goggles

Isometric glassware cross-section for difficulty 3: liquid height tracks difficulty and bubble count tracks run time

Rock Candy: Growing Sugar Crystals on a Seeded Stick

Long soak · bench date 29 Sep 2026

Difficulty 3/5 45 min Goggles

Isometric glassware cross-section for difficulty 3: liquid height tracks difficulty and bubble count tracks run time

An Osmosis Race Between Syrup, Salt Water and Tap Water

Long soak · bench date 22 Sep 2026

Difficulty 3/5 40 min Goggles