Wet Folding Paper Weight Calculator
Calculate the ideal paper weight and water-to-paper ratio for wet folding origami based on model complexity.
What is wet folding?
Wet folding is an origami technique developed by Akira Yoshizawa in the 1950s where the paper is dampened before or during folding. This allows smooth, sculptural curves instead of the crisp geometric folds of traditional origami. When the paper dries, it holds the curved shape permanently.
Paper weight (GSM) explained:
Paper weight is measured in GSM (grams per square meter). Standard copy paper is 80 GSM. For wet folding, heavier papers are essential because:
- They hold more water without falling apart
- They maintain rigidity when damp
- They dry into sturdy, self-supporting sculptures
Paper weight selection by model:
| Model Complexity | Paper Weight (GSM) | Examples |
|---|---|---|
| Simple (under 30 folds) | 90–120 GSM | Simple animals, boxes |
| Moderate (30–60 folds) | 120–160 GSM | Birds, fish, medium animals |
| Complex (60–100 folds) | 160–200 GSM | Detailed animals, masks |
| Very complex (100+ folds) | 200–300 GSM | Multi-layer sculptures |
Paper type recommendations:
| Paper | GSM | Wet Fold Suitability | Notes |
|---|---|---|---|
| Elephant Hide | 110 | Excellent | The gold standard for wet folding |
| Canson Mi-Teintes | 160 | Excellent | Wide color range, textured |
| Tant | 80 | Good (thin for wet) | Best for simple wet folds |
| Watercolor paper | 200–300 | Good | Very thick, for large sculptures |
| Kraft paper (heavy) | 120–150 | Good | Natural brown, sturdy |
| Copy paper | 80 | Poor | Too thin, dissolves when wet |
Water application formula:
The goal is to dampen the paper to 15–25% of its dry weight:
Water amount (grams) = Paper weight (grams) × dampening ratio
| Dampening Level | Ratio | When to Use |
|---|---|---|
| Light mist | 10–15% | Initial dampening, final shaping |
| Medium damp | 15–25% | Active folding, curve forming |
| Heavy damp | 25–35% | Thick paper, deep curves (risk of tearing) |
Worked example:
A 30 cm × 30 cm sheet of 160 GSM Canson:
- Paper area: 0.30 × 0.30 = 0.09 m²
- Paper weight: 0.09 × 160 = 14.4 grams
- Medium dampening (20%): 14.4 × 0.20 = 2.9 grams of water
- That is roughly 3 mL — about 5–6 light mist sprays
Drying method:
After folding, the model must dry completely (4–24 hours depending on thickness). For faster drying with shape retention, use a hair dryer on low heat. For extra rigidity, apply a light coat of methylcellulose (MC) solution before drying — this acts as a stiffening agent that was traditionally used by Japanese paper artists.
Paper sizing:
The key property that makes wet folding work is internal sizing — a starch or gelatin coating inside the paper fibers. When moistened, the sizing softens and becomes flexible. When it dries, it re-hardens and locks the paper into its new shape. Papers without sizing (like tissue paper or rice paper) do not work for wet folding.