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You will be ready for the next step when you stir your solutions with a toothpick and they seem thicker. Pour each solution into a very small bowl, and leave it in a dark place indoors to allow more of the alcohol to evaporate.Use a fork to remove any leaf pieces from the solutions and discard these, while leaving the liquid in the glass.Let the solution sit for 30 minutes in a dark place indoors.How has the color of the alcohol changed? Crush the leaves into the rubbing alcohol using the blunt end of a wooden spoon for about five minutes, until the solution is dark.Add one tablespoon of rubbing alcohol to each glass.Put each group of leaves into the bottom of a drinking glass. Cut the leaves into small pieces with scissors.With a pencil, gently draw a line one inch from the bottom of each strip. They should be long enough to touch the bottom of the tall glass jars or mason jars and still extend over the top. Cut up a strong, thick paper towel into long, one-inch-wide strips. Prepare paper towel strips, making three to four strips for each group of leaves.Separating them into green, yellow and red piles may be easiest. Separate your leaves into distinct groups arranged by color, with about 10 large leaves per group.Collect some leaves that are at different stages of color change during the fall, preferably from the same tree.
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Clothespins or large paper clips (nine to twelve).Tall glass jars, such as mason jars (three to four).Plate (or other surface to protect working area from stains).Strong, white, heavyweight, ultra-absorbent paper towels.Very small bowls or tea-light candleholders (three to four).Wooden spoon or another wooden utensil with a blunt end for crushing leaves.Strong, sturdy drinking glasses (three to four).Leaves at different stages of turning colors (the more the better-about 10 of each color is best).This process separates the mixture of pigments by molecular size-and by color. Larger molecules have a harder time moving in the woven paper and get trapped in the paper first, whereas smaller ones travel farther along the paper. This process dissolves the pigments and allows them to be absorbed by a strip of paper. These molecules also give the red hue to apples, cranberries, strawberries and more.Īlthough a leaf is a mixture of these pigments, you can separate the colors using a method called paper chromatography. There are also anthocyanins, intense red pigments that aren't made during the summer, only appearing with the final group of the fall colors. They're also found in carrots, daffodils, bananas and other plants that have these vibrant colors. These pigments take more time to break down than chlorophyll does, so you see them become visible in fall leaves. Photosynthesis also uses these pigments during the summer, but chlorophyll, a stronger pigment, overpowers them. Xanthophylls are yellow pigments, and carotenoids give leaves an orange color. As fall arrives and the green, food-making color fades, other pigments such as yellow, orange and red ones become more visible. Chlorophyll makes them green and helps carry out photosynthesis during warm, sunny months. There are many types of pigments in plant leaves. Uncover these hidden colors of fall by separating plant pigments with a process called paper chromatography. The leaves' other pigments, some of which were already there during summer, become visible. In autumn, when colder, shorter days arrive, many kinds of trees no longer make food energy with their leaves and, consequently, no longer need the green pigment. This primarily uses a pigment that reflects green light, which gives the leaves their characteristic color. Have you ever wondered why leaves change from green to an amazing array of yellow, orange and red during the fall? Leaves get their brilliant colors from pigments made up of various size, color-creating molecules.ĭuring the warm, sunny months, plants use their leaves to turn sunlight into food energy, a process called photosynthesis.