Dyestuffs

Aluminium sulfate is made by reacting bauxite with sulfuric acid: : 2 Al O (OH) + 3 Hmain SOmain → Almain (SOmain )main + 4 Hmain O Sulfuric acid is also important in the manufacture of dyestuffs solutions.

As the industrial revolution took hold increasing demand for alkali came from higher levels of production of dyestuffs, and bleach.

Dyes from the New World such as cochineal and logwood were brought to Europe by the Spanish treasure fleets, and the dyestuffs of Europe were carried by colonists to America.

In 1913, these eight firms produced almost 90% of the world supply of dyestuffs and sold about 80% of their production abroad.

Sadler's works produced synthetic aniline and alzarine dyestuffs and distilled tar.

Scarce dyestuffs that produced brilliant and permanent colors such as the natural invertebrate dyes Tyrian purple and crimson kermes were highly prized luxury items in the ancient and medieval world.

With the lack of natural color processing available, films of the silent era were frequently dipped in dyestuffs and dyed various shades and hues to signal a mood or represent a time of day.