As an expert in materials science, I can provide you with information on various materials that are commonly referred to by color codes, such as "Red 4." However, without specific context, it's challenging to determine exactly what "Red 4" refers to, as the term could be used in different industries to denote different substances or products. For instance, in the paint industry, "Red 4" might refer to a specific shade of red paint, which could be made from a mixture of pigments and binders. In chemistry, it could refer to a dye or pigment with a specific color index number. In other contexts, it might not even be related to a material at all.

If you're referring to a specific product or compound known as "Red 4," please provide more context or details, and I'll be able to give you a more precise answer.

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Carmine (/?k��?rm?n/ or /?k��?rma?n/), also called cochineal, cochineal extract, crimson lake or carmine lake, natural red 4, C.I. 75470, or E120, is a pigment of a bright-red color obtained from the aluminium salt of carminic acid; it is also a general term for a particularly deep-red color.read more >>