Berry Gouache

Crushed berries thickened with chalk for opaque color.

Color

Magenta, purple, blue depending on berry

Binder

Gum arabic + chalk

Mash berries, strain, and stir into a sticky base of gum arabic and chalk.

▸Chalk makes the paint opaque (it covers what's underneath).
▸Gum arabic holds it all together when dry.
▸Color will shift and fade over time — these are mood paints, not archives.

Steps

01
Crush berries through a sieve; reduce juice on low heat to a syrup.
02
Stir in salt and vinegar to preserve.
03
Mix syrup with gum arabic until dissolved.
04
Stir in powdered chalk a little at a time until creamy and opaque.

Materials

— 1/2 cup berries (blackberry, blueberry, elderberry, pokeberry)
— 1 tsp gum arabic
— 1 tbsp powdered chalk (calcium carbonate)
— Pinch of salt + drop of vinegar

Safety

High Risk

Involves caustics, acids, or open flame. Full PPE and trained supervision recommended.

Hazards identified

Acidic / corrosive etchant
Airborne dust — respiratory irritant

Quick checklist

☐Wear goggles, apron, and acid-resistant gloves
☐Always pour acid into water, not the reverse
☐Neutralize and dispose per local hazardous-waste rules
☐Wear an N95 / FFP2 mask when handling dry powders
☐Mix in a tray to contain dust; wipe surfaces wet
☐Work in a ventilated area; keep food and drink out of the studio
☐Read each material's safety data sheet (SDS) before starting
☐Have water, soap, and a first-aid kit accessible

Heuristic guidance derived from listed materials. Always consult each material's safety data sheet (SDS) and a qualified instructor before attempting.

Notes

Fugitive — stunning in journals, not for archival work.