it was sometimes made of aged, melted snow, and sometimes made from medicinal ink.
it wasn't ink we usually write with.
this medicine contained medicine, like ice, to cool the body, which was cool in nature.
used to dispel heat-toxins. that's right, as well as to dispel your spiritual-burdens.
they also gave you a cold wrap which allowed you to sleep soundly.
once your mind released its nervous energy, you would get better.