Hans Kuhn pioneered using the free electron model to describe the notable feature of conjugated types of these objects, such as polymethines ("poly"-METH-eens).
Hans Kuhn pioneered using the free electron model to describe the notable feature of conjugated types of these objects, such as polymethines ("poly"-METH-eens). Examples of those types of systems include cyanine and azo compounds. Many of them are derived from aniline (ANN-uh-leen) and accridine (ACK-rid-een). Direct ones do not require fixing. The (*) Phoenicians produced one from sea snails called Tyrian, while indigo is a blue one. They are used for the biological staining procedures. For 10 points, name these substances used to color fabrics.
Hans Kuhn pioneered using the free electron model to describe the notable feature of conjugated types of these objects, such as polymethines ("poly"-METH-eens).
{dyes} [prompt on {stain}]