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Place the beets into a pot, then fill the pot with water. Place white cotton or linen fabric into a separate pot. Fill the clothing pot with a 1-to-4 ratio of vinegar-to-water.
How much water you use will depend on the size of the pot. Use enough water to fill the pot 1 to 2 inches (2.5 to 5.1 cm) from the rim. You will be boiling the water shortly, so the temperature does not matter. The pot needs to be large enough for the fabric to be able to move around freely. For best results, use something made from white cotton or linen.  It would be a good idea to wash and dry the fabric beforehand. This will remove any chemicals that might prevent the dye from adhering. Natural dye does not stick well to synthetics, so use natural fibers, such as cotton or linen. You can use this method to dye articles of clothing as well, as long as they are made from white cotton or linen. Fill the pot about a quarter of the way with vinegar first. Push the fabric into the vinegar to ensure that it's soaked through, then fill the remaining three-quarters of the pot with water.  You are only doing this for the pot that has the fabric in it. Don't add anything to the pot with the beets in it. The vinegar will act as a fixative and help the dye adhere better to the fabric. Alternatively, use 1/2 cup (150 g) of salt for every 8 cups (1.9 L) of water.