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A4 checklist with all illustrated steps. Tick the boxes on paper as you go.

FeatherSticks · Fire

How to Make Char Cloth: Tin, Fabric and Step-by-Step Method

A scrap of old T-shirt that turns the weakest spark into an ember.

Quick facts

Time
5–15 min of heating plus 10–15 min of cooling
Difficulty
Easy — the skill is patience and reading the smoke
Best for
Flint and steel, weak sparks, lens fire, practice
You need
Steel tin with a 2–3 mm hole, 100 % cotton, bed of coals

What you need

  • Small steel tin with a tight lid and a 2–3 mm vent hole
  • 100 % cotton fabric (old T-shirt, denim, flannel)
  • Scissors or a knife for cutting squares
  • Nail and pliers for punching the hole
  • Stick, tongs or leather gloves for the hot tin
  • Green twig to plug the hole
  • Zip bag or dry bag for storage
  • Spark tool for testing: steel striker and flint, or a ferro rod

Step by step

  1. Cut cotton into squares

    1 Cut cotton into squares

    Cut clean, dry 100 % cotton into squares of about 5 × 5 cm. Old T-shirts, denim and flannel all work; anything with synthetic fibre does not.

  2. Fill the tin loosely

    2 Fill the tin loosely

    Lay the squares loosely in a steel tin whose lid has one vent hole of 2–3 mm. Do not pack them tight, or the middle stays brown. Close the lid firmly.

  3. Set it on the coals

    3 Set it on the coals

    Push the tin onto a bed of hot coals with a stick, not into tall flames. After a minute or two, smoke jets from the hole and may burn as a small flame.

  4. Wait until the smoke stops

    4 Wait until the smoke stops

    Keep your face away and watch the hole. When no more smoke comes out, usually after 5–15 minutes, the cloth is fully charred.

  5. Plug the hole, cool it closed

    5 Plug the hole, cool it closed

    Lift the tin off with a stick, plug the hole with a twig and let it cool completely. Opened hot, the fresh char starts to glow and turns to ash.

  6. Test it and store it dry

    6 Test it and store it dry

    Good char cloth is evenly black and flexible, and one spark makes it glow. Keep it in a closed tin inside a waterproof bag.

Common mistakes

  • Using a cotton blend or stretch denim that melts instead of charring.
  • Stuffing the tin so full that the middle pieces stay brown.
  • Putting the tin into tall flames, where the smoke cannot be read.
  • Taking the tin off while smoke is still coming from the hole.
  • Opening the tin while it is hot, so the fresh char glows away to ash.
  • Making the vent hole too large, so air gets in and the cloth turns grey and brittle.
  • Storing the char cloth in a leaky container, where it draws moisture.