For example by dipping a piece of cloth in soda, and transferring it to a concentrated acid solution the yellow coloring matter is precipitated on the surface in very great purity. This powder ...

Considerable of the coloring matter is washed off loosely, but enough is taken up by the capillary tubes to dye the hair.' The ammonia may be omitted, and a weak solution of the hydro-sulphuret of ...

How does the color of text when studying or learning something affect a student’s performance on a test? I am an eighth-grader at Central Middle School. For an assignment, I designed and ...