Black.
its colored. CMY
Yes they have got colored India ink.
Yes they used it to write. They are credited with inventing black ink.
Many ancient cultures had ink that was used for writing. The oldest empires to use ink were China and India.
Yes, black printer ink is cheaper than colored ink in general. It's also easier to refill black ink yourself.
When blue ink is distilled, the liquid that distills over will depend on the composition of the ink. Typically, the solvent used in the ink, such as water or alcohol, will distill over, leaving behind the colored components and other additives used in the ink.
The Canon CL51 ink cartridge does come in colored ink. The complete name of this model is actually Canon CL51 High Capacity Color Ink Cartridge and is quite suitable for printing photos.
Black
It was used for art and block printing, as well as caligraphy.
They wrote on papyrus and used a reed brush with ink.
black and white
The black ink is supposed to be darker than the colored ink. However, black ink is composed of all the colored inks combined. Thus, it is merely a mixture of all the other cartridges. This is why is should be bolder and darker.