# Keeping Your Clay Fresh

Unit: Preparing Your Clay
Topic: Weighing & Storing
URL: https://claybook.studio/learn/keeping-your-clay-fresh/

# Storage Saves Your Work

Wedged clay is an investment of your time and effort. Storing it properly means it will be ready to use exactly when you need it.

## The Enemy: Air

Clay dries when air gets to it. Even 20–30 minutes of exposure can form a dry skin on the surface. If you ball that dry surface into the middle of your clay, you end up with hard spots that cause problems on the wheel.

**Rule**: If you are not using the clay right now, it needs to be covered.

## How to Store Properly

1.  **Mist it**: If the clay feels slightly dry, give it a light spray of water before wrapping.
2.  **Wrap tightly**: Use heavy plastic bags. Twist the opening shut and fold it over: no gaps.
3.  **Check for holes**: A single pinhole can dry out a concentrated spot over days or weeks. Check bags regularly.
4.  **Store away from heat**: Kilns, sunlight, and heating vents are the enemies of stored clay.

## Rescuing Dry Clay

If you forget to cover your clay and it dries out partially:

*   **Slightly stiff**: Poke holes in the clay with a finger, add a few drops of water, wrap it tightly and leave for a day. Then re-wedge.
*   **Bone dry**: Break it into small chunks and submerge in a bucket of water. Let it slake down completely to a slurry. Spread the slurry on a plaster bat or dry board to evaporate the excess water. Once it reaches a workable consistency, re-wedge.

## Pro Tip

Label your bags with the clay body type and date. If you have multiple clay bodies in the studio, mixing them by accident is easy, and a mixed clay body can crack during firing.

## Storage Workflow for Busy Sessions

Use this simple flow:

*   End of session: re-bag each clay ball individually.
*   Add label: clay body, weight, and date.
*   Weekly check: inspect for pinholes or stiff spots.
*   If stiffening starts: light mist, rewrap, rest overnight.

Good storage turns tomorrow's setup into a 30-second task.

## Did You Know?

The slaking process for rescuing bone-dry clay works because [clay minerals](https://en.wikipedia.org/wiki/Clay_minerals) can reabsorb water between their plate-like layers, returning to a plastic state. Drying clay on a [plaster](https://en.wikipedia.org/wiki/Plaster) bat is effective because gypsum plaster is highly absorbent and pulls moisture evenly from the slurry. Different clay bodies like [earthenware](https://en.wikipedia.org/wiki/Earthenware), [stoneware](https://en.wikipedia.org/wiki/Stoneware), and [porcelain](https://en.wikipedia.org/wiki/Porcelain) have different shrinkage rates, which is why mixing them causes cracking.

## Check your understanding

### Question 1: What happens if you leave wedged clay uncovered for 30 minutes?

- [ ] A. Nothing, it is fine for a few hours
- [x] B. A dry skin forms that creates hard spots
- [ ] C. The clay gets wetter from humidity
- [ ] D. The clay changes colour

Tip: The surface forms a dry skin. If worked back in, it creates hard spots inside the clay body.

### Question 2: How do you rescue clay that has gone completely bone dry?

- [ ] A. Fire it at a low temperature to soften it
- [ ] B. Throw it away: bone dry clay is unusable
- [x] C. Break it up, slake in water, dry on a bat, then re-wedge
- [ ] D. Mix it with fresh clay and wedge immediately

Tip: Break it into chunks, submerge in water, let it slake to a slurry, then dry on a plaster bat and re-wedge.

### Question 3: What storage habit best prevents hard spots in prepared clay?

- [ ] A. Leave the bag open so moisture can balance
- [x] B. Wrap tightly, check for holes, and store away from heat
- [ ] C. Store near a warm kiln to keep it ready
- [ ] D. Mist daily but keep the bag loose

Tip: Wrap clay tightly with no air gaps and keep it away from heat sources. Small leaks dry specific spots and create hard chunks.