Lamp Oil

Part of Petroleum and Tar

Making clean, reliable lamp oil from petroleum for indoor lighting.

Why This Matters

Before electricity, artificial lighting defined the boundary between productivity and darkness. A community with reliable lamp oil can read, teach, study, plan, manufacture, and perform medical procedures after sunset. Without it, productive hours are limited to daylight — roughly half the day in most latitudes, and far less in winter months when warmth and shelter make indoor activity most necessary.

Petroleum-derived lamp oil is superior to every pre-industrial lighting alternative in availability, brightness, burn duration, and cost. Tallow candles smoke heavily and produce dim, flickering light. Beeswax candles are excellent but require extensive beekeeping infrastructure. Whale oil was the gold standard before petroleum but requires ocean access and whaling capability. Vegetable oils work in lamps but most burn with significant smoke and odor. Petroleum lamp oil — essentially refined kerosene — outperforms all of these.

The art of making good lamp oil from crude petroleum lies not in the distillation itself, which is relatively straightforward, but in the refining and purification steps that transform raw distillate into a fuel that burns bright and clean with minimal smoke, odor, and wick fouling. These steps are simple but critical, and the difference between properly refined and crude lamp oil is dramatic.

What Makes Good Lamp Oil

The ideal lamp oil has specific properties that determine how well it performs in a wick lamp:

Property	Ideal Value	Why It Matters
Flash point	50-65°C (122-149°F)	Safety — must not form explosive vapors at room temperature
Viscosity	Thin enough to wick freely	Too thick = dim flame, too thin = dripping
Color	Water-clear to pale yellow	Dark color indicates impurities that cause smoke
Odor	Mild or none	Strong odor indicates sulfur compounds
Smoke point	High	Clean burning without soot
Residue	Minimal	Does not clog the wick with carbon deposits

These properties are achieved by selecting the right distillation fraction (the kerosene range, 150-275°C) and then removing impurities through washing and filtration.

Producing Lamp Oil Step by Step

Step 1: Distillation

Collect the kerosene fraction as described in Kerosene Fraction. For lamp oil, you want the middle portion of the kerosene range — roughly 170-250°C. The lightest kerosene fractions (near 150°C) are too volatile for optimal lamp safety, and the heaviest fractions (near 275°C) smoke in lamps.

Without a thermometer: After diverting the gasoline fraction, begin collecting. Discard (or save for solvent use) the first 10% of the kerosene fraction and the last 15%. The middle 75% makes the best lamp oil.

Step 2: Water Separation

Raw kerosene often contains emulsified water that causes sputtering and erratic burning in lamps.

1. Pour the raw kerosene into a tall, narrow vessel (a tall clay jar or glass bottle is ideal)
2. Let stand undisturbed for 48 hours minimum
3. Water settles to the bottom as a distinct layer
4. Carefully drain or siphon off the water from the bottom
5. Decant the kerosene from above, stopping before you reach any remaining water

Step 3: Chemical Washing

If Chemicals Are Unavailable

Skip directly to Step 4 (charcoal filtration). Your lamp oil will not be as clean, but it will still work. Many frontier communities used unrefined kerosene for years — it just smokes more and smells worse.

Acid wash (if sulfuric acid is available):

1. Add 2% by volume of dilute sulfuric acid (15% concentration) to the kerosene
2. Stir vigorously for 5 minutes
3. Let settle for 6 hours
4. Decant the kerosene, leaving the dark acid sludge

Alkali wash:

1. Dissolve washing soda (sodium carbonate) in water to make a saturated solution
2. Add 5% by volume to the kerosene
3. Stir for 5 minutes
4. Let settle for 4 hours
5. Decant the kerosene

Final water wash:

1. Mix kerosene with 20% by volume of warm, clean water
2. Stir gently for 2 minutes
3. Let settle for 6 hours
4. Decant the kerosene

Step 4: Charcoal Filtration

This is the most important refining step for lamp oil quality. Activated charcoal adsorbs the color bodies, sulfur compounds, and aromatic hydrocarbons that cause smoke and odor.

Building a charcoal filter:

1. Take a tall container (clay pipe section, wooden tube, or large bottle with bottom removed)
2. Place a wad of clean cotton or linen cloth at the bottom
3. Add a layer of clean, fine sand (2-3 cm)
4. Add a layer of crushed hardwood charcoal (5-10 cm). Crush the charcoal to pea-sized or smaller pieces. The finer the charcoal, the better the filtration.
5. Add another layer of fine sand (2-3 cm)
6. Add another layer of charcoal (5-10 cm)
7. Top with fine sand (2-3 cm) and a cloth cover to distribute the incoming flow

Filtration process:

1. Pour kerosene slowly onto the top of the filter
2. Let it percolate through by gravity — do not force it
3. Collect the filtered oil from the bottom
4. The first few hundred milliliters may contain charcoal dust — re-filter these
5. Continue until flow rate drops significantly, then replace the charcoal

A well-constructed charcoal filter can process 10-20 liters of kerosene before the charcoal is saturated and needs replacement. The used charcoal can be re-activated by heating it to glowing in a sealed container, but replacement is simpler if charcoal is abundant.

Step 5: Final Settling

After filtration, let the lamp oil settle for at least 24 hours in a clean, covered container. Any remaining fine particles or water will settle out. Carefully decant from the top for your finished product.

Testing Your Lamp Oil

Before distributing or using in quantity, test a small sample:

The Wick Test

1. Fill a clean wick lamp with your refined oil
2. Trim the wick evenly
3. Light and adjust to a normal flame height (2-3 cm)
4. Observe for one hour

Good lamp oil: Steady, bright flame. No visible smoke. Minimal odor. Wick remains clean at the tip.

Acceptable lamp oil: Mostly steady flame. Slight wisp of smoke when flame is turned high. Mild petroleum odor. Some darkening of wick tip.

Poor lamp oil: Flickering or sputtering. Visible smoke at any flame height. Strong odor. Wick crusts rapidly with carbon. Needs further refining.

The Paper Test

Place a single drop on clean white paper or cloth. After 30 minutes:

• Good lamp oil: Leaves a faint oily circle that slowly evaporates, no color
• Acceptable: Leaves a slightly yellowish mark
• Poor: Leaves a distinctly colored or dark mark — indicates heavy fractions or impurities

Lamp Design for Petroleum Oil

Different lamp designs extract different performance from the same oil:

Simple Wick Lamp (Easiest to Make)

• A container with a spout or tube holding a cotton or linen wick
• The wick draws oil up by capillary action
• Produces a small, somewhat smoky flame
• Suitable for basic illumination

Flat-Wick Lamp

• Uses a flat, braided cotton wick 1-3 cm wide
• A metal burner holds the wick and controls air flow
• Produces a broader, brighter flame than a round wick
• The standard design of most commercial kerosene lamps

Central-Draft (Argand) Lamp

• Uses a tubular wick with air flowing both inside and outside
• Produces the brightest flame of any wick lamp — equivalent to several candles
• Requires more precise manufacture but dramatically better performance
• This design was the pinnacle of oil lamp technology

Wick Material

The best wicks for petroleum lamp oil are tightly braided cotton. Loosely woven fabric wicks char rapidly and require constant trimming. If cotton is scarce, use tightly twisted linen or hemp — they work but require more frequent trimming. Synthetic fiber wicks (from salvaged materials) may melt rather than char — test before use.

Consumption Rates and Planning

Lamp Type	Oil Consumption	Light Output
Simple wick (small)	15-25 ml/hour	1-2 candle equivalents
Flat wick (medium)	30-50 ml/hour	4-8 candle equivalents
Flat wick (large)	50-80 ml/hour	8-15 candle equivalents
Argand/central draft	60-100 ml/hour	15-30 candle equivalents

For household planning, a family using one medium flat-wick lamp for 5 hours per evening needs approximately:

• 150-250 ml per night
• 4.5-7.5 liters per month
• 55-90 liters per year

Community-Scale Production

A settlement of 50 households with evening lighting needs approximately:

• 2,750-4,500 liters of refined lamp oil per year
• Requiring roughly 3,500-6,000 liters of raw kerosene fraction
• From approximately 15,000-30,000 liters of crude petroleum

This is a significant but achievable production target. One dedicated petroleum processor working with a medium-sized retort (200-liter capacity) could meet this demand with 2-3 distillation runs per week.

Storage and Distribution

Storage

• Store in sealed metal, glass, or glazed ceramic containers
• Keep cool and away from direct sunlight
• Properly refined lamp oil stores for years without degradation
• Keep storage separate from living areas and ignition sources

Distribution Considerations

If your community produces lamp oil centrally, establish:

• Standard measurement containers for consistent distribution
• A refill schedule (weekly is typical)
• Emergency reserves (at least one month’s supply)
• Quality control — test each batch before distribution

Alternatives and Blending

When petroleum lamp oil is scarce, you can extend it by blending:

• 50/50 kerosene + rendered animal fat: Burns acceptably in wick lamps, somewhat smokier
• 70/30 kerosene + purified vegetable oil: Works well, slightly lower brightness
• Kerosene + turpentine (up to 20%): Burns cleanly but increases fire hazard and odor

Pure vegetable oils (olive, rapeseed, sunflower) work in simple wick lamps without any petroleum. The flame is dimmer and smokier, but functional. These can serve as your lighting source until petroleum distillation capacity is established.

Never Blend Gasoline with Lamp Oil

Adding gasoline to lamp oil to make it “burn brighter” is one of the most dangerous things you can do. Gasoline lowers the flash point to explosive levels, and gasoline-contaminated lamp oil has caused countless house fires and deaths. If your lamp oil contains any gasoline fraction, redistill it to remove the volatiles before using in any lamp.