Chemistry & Improvised Materials Science

1. Soap Making

Lye from Wood Ash

Lye (potassium hydroxide, KOH) is extracted by leaching water through hardwood ash. Softwood ash produces weaker lye; hardwood ash from oak, hickory, beech, or maple is best.

Cold Process Soap — Exact Saponification Values

Saponification is the chemical reaction between fat and lye that produces soap and glycerin. Each fat requires a specific amount of lye to saponify completely. Use these values to calculate recipes:

Cold Process Recipe — Basic (1 kg batch)

Hot Process Soap — Faster, More Forgiving

Hot process soap is cooked after trace, which completes saponification before curing. Ready to use in days rather than weeks.

1. Follow cold process to trace.
2. Transfer to oven-safe container (crockpot ideal). Cook at 70–80°C.
3. Stir every 15–20 minutes. Soap will go through phases: applesauce → taffy → Vaseline texture.
4. At Vaseline stage (~60–90 min), test with pH strip (should be 8–10) or zap test (no zing).
5. Add any fragrance or botanicals now (heat would destroy them earlier).
6. Pack into molds quickly — hot process soap is thick and doesn't pour.
7. Usable after 1–2 days. Benefits from a 2–4 week cure for hardness.

Liquid Soap (Soft Soap)

Use potassium hydroxide (KOH) from wood ash rather than sodium hydroxide (NaOH). KOH produces a soft/liquid soap; NaOH produces a hard bar. Follow the same cold process recipe using KOH values from the saponification table. Dilute the finished paste with distilled water to desired consistency.

Medicinal Soap Additives

2. Alcohol Production

Fermentation Basics

Yeast converts fermentable sugars into ethanol and CO₂. Any source of fermentable sugar can produce alcohol. Temperature, nutrient availability, and yeast strain determine efficiency and flavor.

Wash Recipes

Pot Still Construction

POT STILL — COPPER PIPE / PRESSURE COOKER METHOD
──────────────────────────────────────────────────────────────
                         [Thermometer port]
                              │
         ┌────────────────────┴────────────────────┐
    Lid →│             PRESSURE COOKER             │← 15–20L capacity
         │           (your pot/boiler)             │
         └─────────────────┬───────────────────────┘
                           │ (copper tube sealed
                           │  through lid port)
                           │
                     ┌─────┴──────┐
                     │  LYNE ARM  │← 1–1.5" copper pipe
                     │ (angled    │   angled ~30° downward
                     │  downward) │
                     └─────┬──────┘
                           │
              ┌────────────┴──────────────┐
              │      CONDENSER COIL       │← 3/8" or 1/2"
              │  (10–15 feet 3/8" copper  │   copper tubing
              │   coiled in cold water    │   coiled ~15 loops
              │   bucket or cold stream)  │
              └────────────┬──────────────┘
                           │
                      Collection
                      vessel (glass)
                           │
                    [Parrot / hydrometer cup
                     to measure proof live]

MATERIALS:
  • Pressure cooker or large stockpot with lid
  • Copper tubing 3/8" OD (10–15 feet for condenser)
  • Food-grade silicone or copper ferrule for lid connection
  • Large container for condenser cooling water
  • Glass collection vessels
  • Thermometer (reads 75–100°C range)

SEALING: Rye flour + water paste seals joints temporarily.
         Food-grade silicone sealant is better.
         Never use lead solder — lead poisoning.
──────────────────────────────────────────────────────────────

The Cuts — What to Keep and What to Discard

Proofing — Measuring Alcohol Content

• Hydrometer (alcohol meter): Drop into collected distillate; reads ABV (alcohol by volume) directly. Most accurate. Alcohol hydrometers read 0–100% ABV; different from brewing hydrometers which read sugar content.
• Flame test: Dip wick or paper in distillate; light it. Burns with clear blue flame = 50%+ ABV. Burns with yellow flame = 40–50% ABV. Doesn't burn = <40% ABV. Imprecise but useful when no hydrometer is available.
• Target for antiseptic use: 70–90% ABV. Above 90% is actually less effective as a disinfectant (needs some water to denature proteins properly).

Uses by Proof Level

3. Charcoal & Activated Charcoal

Charcoal Production

RETORT CHARCOAL KILN (Steel Barrel)
──────────────────────────────────────────────
         ┌─────────┐
    Lid  │▓▓▓▓▓▓▓▓▓│← Tight-fitting lid (clamp or bolt)
         │         │   Small vent pipe through lid
         │  WOOD   │← Pack tightly; no gaps
         │ CHARGE  │   (billets 6–12" long)
         │         │
         └────┬────┘
              │ ← External fire surrounds barrel
         ═════╪═════   (or barrel sits in fire pit)
              │
              ▼
    Vent gases escape and can be burned
    to provide heat (efficient method)

SIGNS OF COMPLETION:
  ✓ No more smoke from vent
  ✓ Vent gases no longer ignitable
  ✓ Wait for barrel to cool completely before opening
  ✓ Do NOT open while hot — instant ignition
──────────────────────────────────────────────

Activated Charcoal

Regular charcoal has limited adsorption capacity. Activated charcoal has been processed to create an enormous surface area (1 gram can have 500–3,000 m² of surface area) that adsorbs toxins, gases, heavy metals, and pathogens.

Steam Activation

1. Produce regular charcoal (retort method preferred).
2. Heat charcoal to 900–1,100°C in a metal retort or kiln.
3. Inject steam (from a boiling water pot connected via pipe) at this temperature for 30–60 minutes.
4. Steam erodes the char structure, creating the porous surface. Cool under sealed conditions.
5. Result is noticeably lighter, more friable, and deeply black compared to regular charcoal.

Chemical Activation (Zinc Chloride Method)

1. Mix wood shavings or sawdust with a concentrated zinc chloride solution (dissolve ZnCl₂ in water to make 60–80% solution).
2. Soak wood material 24 hours. Drain excess.
3. Heat to 600°C in retort — zinc chloride inhibits tar formation and creates pores.
4. Wash finished product thoroughly with hot water to remove zinc chloride — residual zinc is toxic.

Uses of Charcoal & Activated Charcoal

4. Candles & Oil Lamps

Caloric Cost Comparison

Approximate calories burned per hour of light (equivalent light output)

Oil lamps are the most calorie-efficient light source. Use them over candles when possible for long-term scenarios. Prioritize natural light — schedule tasks in daylight.

Tallow Candles

1. Render fat: Chop kidney fat or other hard fat into small pieces. Melt slowly in water bath at low heat. Strain through cloth. Rendered tallow is white, odorless when cool. Discard crackling and solids.
2. Wick materials: Cotton twine (braid 3 threads); rush pith (stripped inner stem of bulrush — traditional rush light); linen cord. Avoid synthetic materials — toxic fumes. Pre-treat wick by soaking in molten tallow or a solution of borax and salt (prolongs burn and reduces mushrooming).
3. Molds: Rolled paper tubes; hollowed-out tin cans; clay molds; wooden channels. Hang wick through center; pour melted tallow; cool at room temperature. Takes 1–4 hours to fully solidify.
4. Rush lights: Soak dried rush stems in molten tallow; drain; hang to cool. Burn faster than formed candles but require no mold.

Beeswax Candles

Beeswax requires no rendering — melt at 62°C and pour. Burns longer, brighter, and cleaner than tallow with a pleasant honey scent. Requires no wick treatment. The premium candle material. Reserve beeswax for situations where burn quality matters (medical procedures, fine work). Cotton wick at 1:1 height-to-diameter ratio.

Oil Lamps

OIL LAMP — SIMPLE RESERVOIR TYPE
──────────────────────────────────────────────
         [Flame]
           │
    ┌──────┴──────┐
    │   Wick      │← Cotton or plant fiber
    │   (rises    │   twisted tight
    │   by        │   1/4" diameter for
    │   capillary)│   bright light
    └──────┬──────┘
           │
    ┌──────┴──────────────────────┐
    │      Oil reservoir          │← Any non-porous
    │  (clay bowl, tin can,       │   container
    │   glass jar, stone dish)    │
    │  Fill with oil              │
    └─────────────────────────────┘

OILS THAT WORK:
  Best:    Olive oil (cleanest, least smoke)
  Good:    Lard oil (rendered to liquid consistency)
  Good:    Fish oil (smells, but burns well)
  Fair:    Vegetable oil (sunflower, canola, corn)
  Poor:    Mineral oil (petroleum — not renewable)
  Avoid:   Motor oil (toxic fumes)

WICK CHANNEL: Punch small hole in lid or use
  notched clay to hold wick at 45° angle in oil.
  Wick should have 1/4" above oil surface.
──────────────────────────────────────────────

5. Tanning Hides

Rawhide vs. Tanned Leather

Brain Tanning — Step by Step

Vegetable (Bark) Tanning

Bark tanning uses plant tannins (tannic acid) to chemically bind with collagen proteins in the hide, creating a stable, durable leather.

Best tannin sources: Oak bark (highest tannin content), hemlock bark, chestnut bark, sumac leaves and twigs, black walnut hulls, mimosa bark.

1. Prepare bark: Peel fresh bark; dry and grind or crush. Steep in water 24–48 hours to make tannin solution (tea). Bark tea should be dark brown and astringent to taste.
2. Prepare hide: Flesh and dehair as above. Soak in weak tannin solution first ("puering") for 1–2 weeks, then transfer to progressively stronger solutions.
3. Pit tanning: Dig pit or use barrel. Layer alternating hide and fresh bark. Fill with water. Hides must be fully submerged. Weight them down. Visit weekly; add fresh bark as tannin depletes. Process takes 3–12 months for thick hides (shoe-sole leather).
4. Finishing: Remove when hide is uniformly tan-colored throughout thickness. Wash. Apply grease (neatsfoot oil, tallow, cod liver oil) while damp. Allow to dry under slight tension. Work leather while drying to soften.

What Leather Can You Make?

6. Lime & Mortar

Making Quicklime

Limestone (calcium carbonate, CaCO₃) heated above 900°C decomposes into quicklime (calcium oxide, CaO) and carbon dioxide. Quicklime is the foundation of mortar, limewash, and agricultural lime.

Slaking Quicklime

Slaking converts quicklime (CaO) to hydrated lime / slaked lime (Ca(OH)₂) by adding water. Slaked lime is the working material for mortar and limewash.

Mortar and Limewash Recipes

Hydraulic Lime vs. Air Lime

Air lime (non-hydraulic): Sets by carbonation — absorbing CO₂ from air. Only works in air; will not set underwater. Takes weeks to months. Remains somewhat flexible.

Hydraulic lime (NHL): Contains silica/alumina compounds (from clay impurities in the limestone). Sets by both carbonation AND hydraulic reaction (with water). Sets faster, stronger, and works in wet conditions and underwater. Identified by the presence of dark "clinker" spots in the burned limestone — these are silica-rich zones.

Roman concrete (Opus Caementicium): The Romans used volcanic ash (pozzolan — from Pozzuoli, Italy) mixed with lime to create a hydraulic concrete of extraordinary durability. The volcanic ash provides reactive silica. Volcanic ash substitutes: pulverized brick, fired clay, blast furnace slag, rice hull ash, or silica-rich wood ash can provide pozzolanic activity. Mix 1 part lime : 1 part pozzolan material : 2 parts aggregate.

7. Adhesives & Sealants

8. Gunpowder

9. Improvised Cleaning & Sanitation Products

Vinegar

Vinegar is dilute acetic acid produced by acetic acid bacteria (Acetobacter) oxidizing ethanol. Any alcoholic liquid can become vinegar.

Uses: Food preservation (pickling), surface cleaning, pH adjustment in soap making, hair rinse (restores pH after alkaline soap), weed killer (undiluted), meat tenderizing, and as a weak disinfectant.

Washing Soda (Sodium Carbonate)

Baking soda (sodium bicarbonate, NaHCO₃) converts to washing soda (sodium carbonate, Na₂CO₃) by heating:

1. Spread baking soda on a baking sheet in a thin layer.
2. Bake at 200°C (400°F) for 1 hour, stirring occasionally.
3. It loses CO₂ and water, converting to washing soda. The texture changes — it looks more crystalline and coarser.

Washing soda is more alkaline (pH ~11) than baking soda (pH ~8.3). Uses: heavy-duty laundry cleaner, dishwasher detergent substitute, degreaser, drain cleaner. Do not use on aluminum — reacts and corrodes.

Bleach — Storage and Limitations

Lye Solution as Disinfectant and Cleaner

A 10% potassium hydroxide or sodium hydroxide solution in water is an effective surface disinfectant, drain cleaner, and oven cleaner. It is corrosive — use gloves and avoid contact with eyes and skin. Food-grade uses include:

• Pretzels: Brief dip in 3–4% lye solution before baking creates the dark crust and characteristic flavor
• Lutefisk: Fish preserved in lye solution, then rehydrated
• Nixtamalization (corn): Soaking dried corn in 5% lye or slaked lime solution overnight releases niacin (prevents pellagra) and makes amino acids bioavailable. This is critical for corn-dependent communities — communities that adopted corn without nixtamalization (the American South, parts of Europe) suffered widespread pellagra.
• Olive curing: Soaking green olives in dilute lye removes bitter compounds (oleuropein) before brining

10. Chemical Compatibility — What NOT to Mix