"I can't imagine," he said at last. "Of course you could not get the
color even with a brush."
"No," answered Mr. Marwood. "We must first apply to the space we wish
to color a peculiar kind of oil, and afterward dust over this
moistened surface a finely ground metallic color."
"Which sticks only to the oiled part!" Theo exclaimed, quickly.
"You have the idea. Then the superfluous powder is blown off, and when
fired the dust fuses into a solid liquid color, giving us a smoothly
laid band of red, blue, green, or what you will; or perhaps a dish of
solid tone if that has been the intent. We do not use this method for
every type of flat color work, however, because when the powdered
color blows about the workers are apt to inhale it, and it is very bad
for their health. Therefore when it is possible we tint the china by
hand, which can be done if the color is a delicate one and spreads
smoothly; or we color the clay itself."
All this time Theo and Mr. Marwood had been passing through the
factory and going from one building to another; now they entered the
decorating department.
"First I want you to see our air-brush process," Mr. Marwood said.
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