The production of good black ointment is too thin how to become hardened

Black ointment in the production process of oil refining process is not long enough, the next Dan too early, will cause the ointment you say is too thin, you can lengthen the oil refining process, the so-called "drip into a bead" means to master the refining of the fire.

Drops of water into a bead of the standard strictly outlined as: dip a little oil and test beads of water at a certain height from the surface of the water (15-20cm) drops into the water, to be oil droplets scattered and then gathered for the degree. If the objective standard as an indicator, can be measured to determine the softening point, the general "old and young moderate" softening point of 51.4 ± 0.7.