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Text File  |  1992-09-02  |  312b  |  9 lines
  1. A by-product of charcoal manufacture, made
  2. from wood tar, the condensed liquid produced
  3. from burning charcoal gases. The wood tar is
  4. boiled to produce the correct consistency. It
  5. has been used since ancient times for
  6. caulking wooden ships (filling in the spaces
  7. between the hull planks to make them
  8. watertight).
  9.