Botanical Leaf Stomata Wax Relief Micro-Topography

45 mins Ages 10-14 Indoor

A challenging, hands-on discovery and STEM project designed for curious young minds aged 10 to 14.

Materials Needed

  • • Plaster of Paris powder (1 cup)
  • • Modeling clay (1 block)
  • • Fresh leaves with prominent veins (e.g., fern, oak, fig) (2–3 leaves)
  • • Rolling pin and water cup (1 set)
  • • Cardboard strip and tape (retaining ring) (1 set)

Pro Tips

  • → Press the textured, vein-heavy side of a leaf firmly into a flat slab of soft modeling clay, then peel it away to leave a negative impression.
  • → Wrap a cardboard collar around the clay slab, mix Plaster of Paris with water, and pour it into the impression.
  • → Once set and cured, peel away the clay to reveal an exact, raised-vein positive stone fossil plaque.

Safety First

Do not wash wet plaster down sink drains; wipe tools with paper towels before rinsing.

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Step-by-Step Instructions

1

Step 1

Roll a flat, smooth 1 cm thick slab of modeling clay on a clean table.

2

Step 2

Press a leaf firmly vein-side down into the clay with a rolling pin, then peel it away to leave a detailed negative imprint.

3

Step 3

Fit a circular cardboard wall around the clay edge and pour in mixed Plaster of Paris to a depth of 1.5 cm.

4

Step 4

Allow to set for 20 minutes, peel the clay away, and reveal the raised botanical stone relief plaque.

What they are learning

Biological surface replication and positive/negative casting Fossil mold and cast taphonomy Leaf venation architectural micro-relief