Filtration & Drying
Filter the indigo slurry. Pass the indigo through colanders (or whatever you have decided to use as a filter system) lined with natural silk (e.g., crepe de chine) or a table-screen using 25-micron nylon filter fabric. This removes most of the sediment while allowing the liquid to drain slowly. Allow the sediment to settle. Over several days, the water will drain, leaving behind indigo sediment that looks like wet mud with the consistency of yogurt. Gently redistribute the mud. Use spoons or squeegees to move and level the mud as it continues drying carefully. Catching the filter water when you shift is helpful, as moving the mud tends to push some indigo through the screen.
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