1. Principle
After placing the ink on the filter paper for a certain period of time, observe whether the oil ring on the filter paper absorbs the ink bleed is colored, to check the ink bleeding.
2. Tools and materials
(1) Adjusting the ink knife;
(2) Qualitative filter paper.
3. Inspection method
(1) Stir the test ink sufficiently with an ink-adjusting knife, and stack a small amount on the qualitative filter paper.
(2) After 1h, observe the color penetrating around the ink. It is better if the oil ring does not have blue, yellow brown or other colors.
Dominoes (or dominos) is a game played with rectangular "Domino" tiles. The traditional Sino-European domino set consists of 28 dominoes, colloquially nicknamed bones, cards, tiles, tickets, stones, or spinners. Each domino is a rectangular tile with a line dividing its face into two square ends. Each end is marked with a number of spots (also called pips, nips, or dobs) or is blank. The backs of the dominoes in a set are indistinguishable, either blank or having some custom design. A domino set is a generic gaming device, similar to Playing Cards or dice, in that a variety of games can be played with a set.
Modern commercial domino sets are usually made of synthetic materials, such as melamine (or urea) and acrylic; many sets approximate the look and feel of ivory while others use colored or even translucent plastics to achieve a more contemporary look. Modern sets also commonly use a different color for the dots of each different end value (one-spots might have black pips while two-spots might be green, three red, etc.) to facilitate finding matching ends.
The traditional set of dominoes contains one unique piece for each possible combination of two ends with zero to six spots, and is known as a double-six set because the highest-value piece has six pips on each end (the "double six"). The spots from one to six are generally arranged as they are on six-sided dice, but because there are also blank ends having no spots there are seven possible faces, allowing 28 unique pieces in a double-six set. Sometimes dominoes have a metal pin (called a spinner or pivot) in the middle.
Domino
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