Catalog entry for instruments designed for photometric analysis. Photometers can be used to measure the presence and concentration of organic and inorganic compounds in solution by determining the absorbance of specific…

Tin container of powdered henna pigment manufactured by S. B. Penick & Company. Henna is a dye prepared from the plant Lawsonia inermis, also known as the henna or mignonette tree. Whole henna leaves must be dried and…