---
title: Glaze Testing Made Easy: Predict Color Before Firing
siteUrl: https://logzly.com/wheelandclay
author: wheelandclay (Wheel & Clay Studio)
date: 2026-07-06T02:01:52.814108
tags: [glaze_testing, ceramic_art, diy_pottery]
url: https://logzly.com/wheelandclay/glaze-testing-made-easy-predict-color-before-firing
---


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Tired of firing a full kiln only to discover a surprise hue? This guide shows you **exactly how to predict glaze color before firing** using a cheap, printable cheat sheet—so you can stop guessing and start saving time, clay, and energy. Follow the step‑by‑step system below and get reliable results in under an hour.

## Why Traditional Glaze Testing Fails  

Most potters rely on the “fire and see” method, a risky gamble that wastes material and kiln hours. The core problem isn’t the glaze itself; it’s the lack of a **quick, repeatable glaze testing** process that lets you see color changes without a full glaze fire. Pair this workflow with the **[right clay body for wheel‑thrown pieces](/wheelandclay/how-to-choose-the-right-clay-body-for-wheelthrown-pottery)** to ensure the glaze behaves as expected on your chosen substrate.

By breaking recipes into tiny batches and using a bisque fire, you create a **low‑cost preview** that mimics the final outcome.

## Low‑Cost Cheat Sheet for Precise Color (The Core of Glaze Testing)  

A printable **[glaze testing cheat sheet](/wheelandclay/glaze-testing-made-easy-predict-color-before-firing)** lets you track three variables—base ratio, colorant amount, and fired hue—on a single sheet. Keep one in your studio drawer and pull it out whenever you plan a new glaze.

### What You Need  

- **[Digital kitchen scale](https://www.amazon.com/s?k=digital+kitchen+scale&tag=organizationtip101-20)** (0.1 g precision)  
- Small [mixing bowls](https://www.amazon.com/s?k=mixing+bowls&tag=organizationtip101-20) (shot‑glass size works)  
- [Permanent marker](https://www.amazon.com/s?k=permanent+marker&tag=organizationtip101-20) for labeling  
- Cheap test tile or a broken piece of pottery  

### Setting Up the Sheet  

1. **Print** the sheet from Wheel & Clay Studio’s site.  
2. Fill in rows for glaze name, base ratio, colorant amount, and a box for the fired color note.  

## Step‑by‑Step Guide to Predicting Glaze Color  

### 1️⃣ Mix Mini Batches  

- Reduce the full recipe to a **10 g batch** (e.g., 7 g base, 2 g water, 1 g colorant).  
- Create two variations: **+0.5 g colorant** and **–0.5 g colorant**.  
- Record each formula on the cheat sheet.

### 2️⃣ Label & Bisque Fire  

- Mark each test tile with the exact numbers.  
- Fire at **950 °C for ~1 hour** (bisque fire). This melts the glaze enough to reveal color without a full glaze cycle.  

### 3️⃣ Compare & Record  

- After cooling, hold tiles to daylight and match them to the [reference chart](https://www.amazon.com/s?k=reference+chart&tag=organizationtip101-20) on the sheet.  
- **Bold adjustments**: if too dark, subtract colorant; if too light, add a pinch.  

### 4️⃣ Refine the Recipe  

- Choose the ratio that hits your target hue.  
- Transfer the final numbers to a “master” sheet for future use—no more guesswork.  

## How This Saves Time & Money  

- **Material cost**: Only a few grams of glaze per test.  
- **Energy cost**: Bisque fire uses a fraction of a full glaze fire.  
- **Time**: Color preview in under an hour vs. days of waiting for a full fire.  

Over a season, the savings add up to the price of a [cup of coffee](https://www.amazon.com/s?k=cup+of+coffee&tag=organizationtip101-20)—plus the [peace of mind](https://www.amazon.com/s?k=Peace+of+Mind&tag=organizationtip101-20) that your next kiln load will match your vision. Considering the **[clay body you’re using](/wheelandclay/how-to-choose-the-right-clay-body-for-wheelthrown-pottery)** can further improve consistency and reduce waste.

## Quick Recap  

1. Print the **glaze testing cheat sheet**.  
2. Mix three 10 g batches (baseline, +0.5 g, –0.5 g).  
3. Bisque fire at 950 °C for ~1 hour.  
4. Compare to the reference chart and adjust.  
5. Record the final recipe for repeatable success.  

Grab the free printable from Wheel & Clay Studio’s newsletter and share it with fellow potters who are fed up with surprise colors.