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SLS is used as a reducing agent as well as a bleaching agent when it comes to indigo based VAT dying.

Avoid any leakage of SFL as it is of a toxic nature. Use durable containers and a proper procedure to use SFL as a bleaching, reducing, or discharge agent.

One of the plastic items which made form nylon, which is commonly used for the production of Frisbee discs, should be best dyed in water that has acid dye by heating it. Mild acids like vinegar may also be added to the water to reach certain pH level.

Natural dyes are acquired from natural sources like plants, leaves, flowers, and wood. It was Neolithic period, when dyes first came into existence.

You simply cannot color some plastics at home. Some of them have to be dyed only when they are in the liquid form. For instance, polypropylene that is marked with recycle log 5 is used for making water bottles, sports clothing, stain-resistant carpets, and upholstery materials.