The inks are supposed to be best writing inks, quick drying, waterproof and durable. So, manufactures introduced alkali-resistant dyes in caustic soda solutions.

The ink which gives permanent color, usually violet or purple, to iron compounds, with other ingredients.

Finely ground graphite mixed with clay and forced through small holes issuing in long twine-like strands, then baked and glued into a circular glove, between two semi-cylindrical strips of woods.

These inks are usually composed of a blend aniline dye, carbon black with glycerin and oil such as olein or castor oil.

Indigo added to an iron tannin solution. Blue at time of writing, but that fades, the iron oxidizes, and the writing turns black.

Finely ground graphite, clay and aniline dye mixed and made into the writing center, or core, of wood holders.

Natural graphite sawed into thin sheets thicker on one edge than on the other and then glued between two grooved pieces of wood.

These substances absorb the shorter wavelength of the light incident upon the paper and fluoresce with a bluish color or glow.

The ink that consisted essentially of a mixture of ferrous sulphate and an infusion of nutgalls.

These inks are very much resembles stamp pad inks and are exclusively made with basic dyes.

At one time was made from vegetable juices and from silver compounds, but today aniline black is used.

This ink is made up of water solution of synthetic blue-black or purple-black ink for stylographic pens was introduced.

This type of ink was also made anciently from the soot scrapped from the cooking vessels.

The commonly used “iron blues” date from the early 18^th century and the common additive to white paper.