The lichen is extracted by urine or ammonia, then the extract is acidified, the dissolved dye precipitates out and is washed.
Then the extract is acidified, the dissolved dye precipitates and is washed. The lichen is extracted by urine or ammonia.
The lichen is extracted by urine or ammonia. Then the extract is acidified, the dissolved dye precipitates and is washed.
The lichen is extracted by urine or ammonia. Then the extract is acidified, the dissolved dye precipitates and is washed.