Materials

1. 240 ml water
2. 24 g gelatin powder
3. 10–12 g glycerin (plasticizer → flexibility)
4. 5 ml acetic acid (or white vinegar)
5. 15–25 g substrate
6. Choose one:
7. Coffee grounds (dried) → darker, textured material
8. Eggshell powder (very finely crushed) → stronger, lighter color

Optional:

1. Natural dyes (coffee, turmeric, beet powder)
2. Fibers (cotton threads, fabric scraps)

؜1. Prepare the substrate Coffee grounds: rinse and dry them completely. Eggshells: wash, remove membrane, dry, and grind into very fine powder.

2. Heat the water Pour 240 ml water into a pot and heat on low heat (do not boil).

3. Dissolve gelatin Slowly sprinkle 24 g gelatin while stirring continuously until fully dissolved.

4. Add glycerin Mix in 10–12 g glycerin and stir well.

5. Add acetic acid: Add 5 ml vinegar/acetic acid and mix.

6. Add the substrate Stir in 15–25 g coffee grounds or eggshell powder. Mix until evenly distributed.

7. Cast the material Pour the mixture onto: silicone mat acrylic sheet plastic tray Spread evenly with a spatula.

8. Dry Let dry 24–72 hours at room temperature. Slow drying gives better strength.

9. Peel and condition Once dry: peel carefully optionally rub with a little vegetable oil to soften.

Material Behavior

More glycerin → softer and flexible

More substrate → stronger but less flexible

Thicker layer → more leather-like