How does Black Magic work?
coffee filter, the water in the ink carries the pigment onto the paper. When the ink dries, the
pigment remains on the paper. When you dip the paper in water, the dried pigments
dissolve. As the water travels up the paper, it carries the pigments along with it. Different-
colored pigments are carried along at different rates; some travel farther and faster than
others. How fast each pigment travels depends on the size of the pigment molecule and on
how strongly the pigment is attracted to the paper. Since the water carries the different
pigments at different rates, the black ink separates to reveal the colors that were mixed to
make it. In this experiment, you're using a technique called chromatography. The name
comes from the Greek words chroma and graph for "color writing." The technique was
developed in 1910 by Russian botanist Mikhail Tsvet. He used it for separating the pigments
that made up plant dyes. Your experiment flows through a stationary substance (like your
coffee filter). Since different ingredients in a mixture are carried along at different rates, they
end up in different places. By examining where all the ingredients ended up, scientists can
figure out what was combined to make the mixture. Chromatography is one of the most
valuable techniques biochemists have for separating mixtures. It can be used to determine
the ingredients that make up a particular flavor or scent, to analyze the components of
pollutants, to find traces of drugs in urine, and to separate blood proteins in various species
of animals (a technique that's used to determine evolutionary relationships).
이때 커피 필터는 물과 색소를 분리해 주는 역할을 해 주고 있습니다 .