Hanging White Piece
Hanging white block, one of the commonly used reducing agents for printing and dyeing. Also known as diao bai fen, is a combination of formalin sodium bisulfite reduction, chemical name for sodium bisulfite formaldehyde or formaldehyde combined with sodium bisulfite. White block or crystalline powder, soluble in water. It is stable at room temperature and has strong reducibility and bleaching effect at high temperature. In the event of acid decomposition, its aqueous solution in more than 60℃ began to decompose harmful substances, 120℃ decomposition produced formaldehyde, sulfur dioxide and hydrogen sulfide and other toxic gases.
Suspension white is strictly prohibited in the use of food, illegal traders add suspension white in food is to use its decomposition of formaldehyde has increased food elasticity, sulfurous acid has the role of bleaching food, make steamed bread white, and has strength, elasticity and toughness. But there will be a considerable amount of formaldehyde and sulfite residue in food after use. Formaldehyde stimulates nerve, and have strong carcinogenicity: sulfite can destroy vitamin B1, affect growth and development, prone to multiple neuritis, appear bone marrow atrophy and other symptoms, with chronic toxicity and carcinogenicity.