“I burned a piece of tissue on a white plate and I was surprised by what I saw – it turned into black ash and left a layer of a greasy and sticky thing on the plate which could not be washed away.” Huang added.

Many bathroom tissues in China are made from recycled paper. Deinking agents, softener, chlorine, talcum powder (calcium carbonate), fluorescent brighteners, dispersing agent, bleaching agents and other chemicals are often added to recycled paper to make whiter and softer tissues.

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