Alugbati, known in the U.S. as Malabar spinach, is commonly grown for its soft, spinach-like leaves and shoots. Alugbati is of African and East Asian origin. The juice of the fruits was reportedly used in ancient China as ink for official seals. Today, the fruits of the red-stemmed alugbati variety can be used to make ink. As of May 2010, the government of the Philippines is researching commercial production of ink extracted from the alugbati fruits.
Pick the alugbati fruits at full ripeness, when it is round, plump and dark purple in color. You will need about three cups of fruit to produce one cup of juice.
Crush the fruits and seeds in a mortar and pestle.
Strain the juice into a bowl. Discard the solid fruit and seed remains. Repeat until you've procured one cup of juice.
Add the rubbing alcohol, white vinegar, salt and iodine and stir.
Transfer to a bottle or jar and seal until use.