Natural dyes can stain your clothes and work surfaces just as much as chemical dyes. Make cleanup easier and avoid stains by covering your workspace.  Wear clothes you don't mind getting dirty or put on a smock. For protein-based fibers, like cashmere, wool, and silk, soak the garment in mild dishwashing detergent and warm water (cool water for wool). For cellulose-based fibers like cotton, linen, and hemp, soak the garment in soda ash and warm water. Soak the clothes for at least 1-2 hours, or up to 4 hours. Keep them on the stove over a low heat. You can make soda ash by putting baking soda in the oven at 200 °F (93 °C) for 1 hour. A mordant is a mixture of a mineral and water that allows the dye to adhere to the fibers. Soak the clothes for about 20 minutes in a stockpot full of water and mordant at a low simmer, then turn off the heat and allow the clothes and water to cool. Use different mordants depending on the result you want:  Alum is the most readily available mordant. You can find it in some supermarkets, craft stores, or online. Use 1⁄4 pound (0.11 kg) of alum in a warm water bath for every 1 pound (0.45 kg) of material you want to dye. Using too much alum can make the fibers sticky. Iron is an effective mordant but will darken the end result with a brownish tint. Use iron for earth tone results. To create an iron bath, boil a few old nails in a large pot of water. Use copper to give your end result a greenish tint. Make a copper bath with a few old pennies (from before 1982) in boiling water, or buy copper sulfate online. Copper is toxic to consume, so don't use a pot that you use for cooking and work in a well-ventilated area. Use a small amount of tin for clear, color-fast results. Use a very small amount, and as with copper, don't use a pot that you will make food in and work in a well-ventilated area. Dye fixatives allow your clothes to absorb the dye more readily and prevent the dye from washing out later. The best type of fixative will depend on the type of dye you are using:  When dyeing...

How would you rephrase that briefly using Vietnamese?
Phủ bạt ni-lông hoặc giấy báo lên mặt phẳng dùng để nhuộm quần áo. Tẩy sạch quần áo mà bạn muốn nhuộm màu bằng bột giặt hoặc soda ash (một loại muối cacbonat của natri). Ngâm quần áo trong chất cẩn màu nhuộm khoảng 20 phút. Ngâm quần áo trong nguyên liệu hãm màu khoảng 1 tiếng. Xả sạch quần áo bằng nước lạnh trước khi nhuộm màu. Chuẩn bị nguyên liệu thực vật đã chín cây để làm màu nhuộm tự nhiên. Cắt nguyên liệu thực vật và cho vào nồi nước to. Đun liu riu nguyên liệu thực vật ít nhất 1 tiếng hoặc qua đêm. Lọc nguyên liệu thực vật trong nước nhuộm. Đun liu riu quần áo trong nước nhuộm khoảng 1-8 tiếng. Xả quần áo đã nhuộm với nước lạnh.