On the working day, frozen dog head were allowed to thaw.
Skin and most of the muscles were separated and eyes were enucleated.
Heads were heated to over 80°C for at least 1 hour in solution of surfactant (detergent) and soap chips.
Muscles of boiled heads were separated with the aid
of forceps and scalpel in running water
Further separation of muscles and ligaments from the
skulls was done after left in detergent water at least
20-30 minutes.
Separation of remaining muscles and ligaments from the skull was done after left in 1% sodium hypochlorite solution for at least 24 hours.
After that, the skulls were left in the above solution, for 48-72 hours with solution, being changed at least twice and clean in running tap water.
The skulls were then left to dry.