# Sovereignty Module: Fire the Chamber

## Complete Kiln Loading and Firing Schedule: From Raw Ware to Finished Pottery

Kiln firing transforms fragile clay into permanent ceramic. This campaign covers loading strategy, firing schedules, cone systems, atmosphere control, and troubleshooting.

### Chapter 1: Firing Stages

| Stage | Temperature Range | Duration | What Happens |
|---|---|---|---|
| Water smoking | Room temp to 400°F | 2-4 hours | Remaining moisture evaporates |
| Burnout | 400-1000°F | 2-3 hours | Organic matter burns out |
| Quartz inversion | 1063°F (573°C) | Slow through | Quartz crystal structure changes |
| Sintering | 1000-1650°F | 2-3 hours | Clay particles begin bonding |
| Vitrification | 1650°F to target | 2-4 hours | Glass forms between particles |
| Soaking | Target temperature | 15-30 minutes | Even heat distribution |
| Cooling | Target to room temp | 12-24 hours | Controlled cool-down |

### Chapter 2: Kiln Loading

| Loading Rule | Specification | Why |
|---|---|---|
| No touching | 1/4 inch between pieces | Pieces fuse if touching |
| No shelf contact (glazed) | Wax foot, kiln wash shelf | Glaze bonds to shelf |
| Even distribution | Spread weight evenly | Prevents shelf warping |
| Tall pieces center | Short pieces at edges | Even heat distribution |
| Airflow gaps | Leave gaps between rows | Heat must circulate |
| Lid on pot | Fire lid on matching pot | Ensures fit after shrinkage |

Loading strategy: 1) Plan loading before starting (dry fit). 2) Bottom shelf: heaviest pieces. 3) Middle shelves: medium pieces. 4) Top shelf: lightest, smallest pieces. 5) Leave 1/2 inch clearance above tallest piece on each shelf. 6) Do not block flue or chimney opening. 7) Place cone packs at top, middle, and bottom (monitor temperature).

### Chapter 3: Firing Schedules

Bisque firing (cone 06, 1828°F): 1) Room temp to 200°F: 1 hour (100°F/hour). 2) 200°F to 400°F: 2 hours (100°F/hour). 3) 400°F to 1000°F: 3 hours (200°F/hour). 4) 1000°F to 1063°F: 1 hour (slow through quartz inversion). 5) 1063°F to 1828°F: 3-4 hours (200°F/hour). 6) Hold at 1828°F: 15 minutes. 7) Turn off kiln, cool naturally (do not open until below 200°F).

| Firing Type | Target Cone | Target Temp | Total Time | Atmosphere |
|---|---|---|---|---|
| Bisque | 06 | 1828°F | 10-12 hours | Oxidation |
| Low-fire glaze | 06-04 | 1828-1940°F | 8-10 hours | Oxidation |
| Mid-fire glaze | 5-6 | 2167-2232°F | 10-12 hours | Oxidation or reduction |
| High-fire glaze | 9-10 | 2300-2345°F | 12-14 hours | Reduction |
| Salt/soda | 10 | 2345°F | 12-14 hours | Reduction + salt/soda |

### Chapter 4: Atmosphere Control

| Atmosphere | Method | Effect on Glaze | Effect on Clay |
|---|---|---|---|
| Oxidation | Full air supply | Bright, clean colors | Light body color |
| Reduction | Restricted air | Muted, complex colors | Dark body color |
| Neutral | Balanced air | Between oxidation and reduction | Moderate body color |
| Heavy reduction | Very restricted air | Carbon trapping, metallic | Very dark body |

Reduction firing: 1) Begin in oxidation (full air) through bisque temperatures. 2) Start reduction at cone 010 (1650°F). 3) Reduce by closing damper partially. 4) Flame should lick out of spy holes (positive pressure). 5) Maintain light reduction through firing. 6) Heavy reduction at end (last 30 minutes). 7) Reduction starves the kiln of oxygen. 8) Iron in clay and glaze changes color (red to gray/brown).

### Chapter 5: Troubleshooting

| Problem | Cause | Solution |
|---|---|---|
| Cracking | Too fast through water smoking | Slow down below 400°F |
| Bloating | Too fast at high temperature | Slow down above 2000°F |
| Dunting | Too fast cooling through quartz inversion | Do not open kiln above 1100°F |
| Glaze crawling | Dusty bisque surface | Clean bisque before glazing |
| Glaze pinholing | Insufficient soaking time | Extend soak at peak temperature |
| Uneven firing | Poor loading, blocked airflow | Improve loading, check flue |
| Under-fired | Insufficient temperature | Check cones, extend firing |
| Over-fired | Excessive temperature | Check cones, reduce time |

### Reference Card

1. Never rush the water smoking stage (moisture trapped in clay expands to steam at 212°F; if the kiln heats too fast, steam pressure shatters the pottery; the first 400°F must be slow). 2. Quartz inversion is the danger zone (at 1063°F, quartz crystals in clay change structure and expand; heating or cooling too fast through this temperature causes cracking (dunting); go slow). 3. Cone packs are essential (pyrometric cones measure heat work (time + temperature); a thermometer alone is not sufficient; cones placed at top, middle, and bottom reveal temperature variations). 4. Do not open the kiln until cool (opening a hot kiln causes thermal shock that cracks pottery; the kiln must cool to below 200°F before opening; patience is the final step of firing). 5. Reduction changes everything (restricting oxygen during firing causes chemical changes in clay and glaze; iron turns from red to gray, copper turns from green to red; reduction is the potter's alchemy). 6. Even loading ensures even firing (pieces packed too tightly block airflow; pieces loaded unevenly cause hot and cold spots; thoughtful loading is as important as the firing schedule). 7. Every kiln is different (firing schedules are guidelines, not rules; each kiln has its own personality, hot spots, and quirks; the potter must learn their specific kiln through experience). 8. Firing is the moment of truth (all the work of preparing clay, throwing, trimming, glazing, and loading comes down to the firing; a successful firing transforms fragile clay into permanent, beautiful ceramic).