Black phosphating of iron and steel is a new surface treatment process made a feature of using HHS blackening additives.
In the spring fire swept across the hills, blackening them.
The married women in the village still keep the practice of blackening their teeth.
The existing methods of zinc plating blackening by black passivating, coloring, dyeing, etc. are studied, and the high resistance to corrosion of the passivator is highlighted.
A newly developed high efficient degreasing and rust removing solution for pre blackening treatment of high strength bolt is presented.
The said liquid consists of blackening liquid and phosphatization liquid.
a disease blackening the leaves of pear and apple trees.
The influence of ammonium molybdate, cobalt sulphate, ammonium bifluoride, acidity of blackening bath, blackening bath temperature and time on film quality were studied.
Said product possesses of fairly good actions of style keeping, nourishing hair, blackening hair and features convenient for use, no need of electric blowing and without inflammable danger.
Wearing masks and other disguises and blackening the face with soot were originally ways of hiding oneself from the spirits of the dead who might be roaming around.
國文精選館
