What are the reasons for fertilizer dyeing?

What are the types of dyes In general, fertilizer dyes are the following: 1. Water-soluble dyes, pigments or oil-soluble color enamel. 2. Naturally colored substances such as humic acids, certain polysaccharides. 3. Inorganic pigments, such as iron oxide series dyes.

How much of the colorant is added is suitable for sunset yellow, a food additive approved for use in China. According to the “Hygienic Standards for the Use of Food Additives” (GB2760), the maximum allowable amount is used for Juice Drinks, carbonated drinks, sweets, and cakes. It is 0.1 g/kg, which is the amount of 0.1 added. Syrups are used for jams, fruit sauces, mayonnaise, and salad dressings. The maximum allowable amount is 0.5 g/kg, which is the addition of 0.5.

According to a senior person in the fertilizer industry, the amount of pigment added to water-soluble fertilizers is generally around 0.4, which is less than the allowable amount of salad dressings directly consumed by humans.

Why do chemical fertilizers add dye? First, many manufacturers design different formulations into different colors, allowing farmers to identify fertilizers quickly through color, and reasonably correspond to fertilizer formulations that each crop should use at different growth stages. Second, the concentration of fertilizer can't be seen directly after diluting the fertilizer without dyeing. This often misleads the farmers. With the dyed fertilizer, farmers can easily judge the concentration of fertilizer by the depth of color after dilution. Third, many fertilizer manufacturers add very few trace elements or additives to fertilizers. They need to determine the appearance of the fertilizer to determine whether the mixing effect of the fertilizer has reached an ideal state.

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