| Name | Bronze Red |
| Synonyms | Bronze Red Pigment Golden Red |
| Physical and Chemical Properties | Chemical quality This product is yellow red powder, the powder is light, soft and greasy, and has certain transparency. Strong coloring power, the ink made has strong golden light. Good acid and alkali resistance. |
| Use | Use 1, mainly used in the manufacture of ink, as well as watercolors and crayons. 2, for the coloring of ink and cultural materials. |
features
yellow light red powder, light, soft and fine powder, with a certain degree of transparency, strong tinting power, the made ink has strong golden light, good acid and alkali resistance, and poor sun resistance.
production process
P> add water in the diazotization kettle, 30% aniline hydrochloride, stir into salt to dissolve, add ice to cool to 4 ℃, add 30% sodium nitrite solution under the liquid surface, and the temperature rises to 8 ℃. at this time, the Congo red test paper is dark blue, the potassium iodide starch test paper is light blue, the diazonium solution is transparent, and stir for 30 minutes. Adjust the volume with water. Add water to an iron coupling pot, then add 30% liquid alkali, heat to 70 ℃, add pull-open powder and tryptopol AS, stir, heat to about 80 ℃, dissolve clean, immediately add cold water to dilute, add aniline diazonium salt to naphthol AS solution at a temperature of 38~39 ℃ for 8 minutes, and the temperature after diazonium salt is added is 31~32 ℃, diazonium salt slightly excessive (with H acid test solution should be red) after 15 minutes gradually disappear, the medium is strong alkaline, reaction for three hours, filtration, rinsing, drying, crushing.