Ink

Ink is a liquid or paste that contains pigments or dyes and is used to color a surface to produce an image, text, or design.

Description of what it is like

Ink is usually a dark liquid, though it can come in many colors. It is designed to flow smoothly from a tool (like a pen or brush) and adhere to a surface (like paper or skin). Once applied, it should dry relatively quickly to prevent smearing.

Origin and where to find it

• Environments: It is a manufactured product, created by combining materials from various environments.
• Signs: Historically, the first inks were made from lampblack (soot) or charred bones.
• It is a synthetic/processed material.

Minimum processing required

• Pigment preparation: Grinding charcoal or collecting soot from a flame.
• Binder addition: Mixing the pigment with a sticky substance (gum arabic from acacia trees, or egg white) to help it stick to the surface.
• Solvent mixing: Adding water or oil to achieve the desired consistency.
• Filtration: Ensuring the liquid is free of large particles that could clog tools.

Tools needed to work on it

• Mortar and pestle for grinding.
• Mixing containers.
• Fine strainers or cloth for filtering.
• Storage vials or inkwells.

Common forms of use

• Carbon ink: Made from soot and binders (India ink).
• Iron gall ink: Made from iron salts and tannic acids from vegetable sources.
• Modern inks: Complex chemical formulations for specific printers or pens.

Possible substitutes

• Berry juices: For temporary stains.
• Blood: Historically used in emergencies.
• Charred sticks: Can be used directly, though less permanent than liquid ink.

Limitations and common failures

• Smudging: If the ink dries too slowly or the surface is not absorbent.
• Fading: Some inks (especially vegetable dyes) fade when exposed to sunlight.
• Clogging: If the pigment particles are too large or the binder dries in the tool.

Risks and safety

• Toxicity: Some historical inks used heavy metals (like lead or mercury); modern inks are generally safer but should not be ingested.
• Permanent stains: Difficult to remove from clothing or skin.

Related materials

• Pigments: The coloring agent.
• Brush: Tool for application.
• Charcoal: Common source of black pigment.
• Water: Most common solvent for basic ink.
• Paper: The primary surface for ink application.
• Leather: Can be used as a surface for writing with ink (as parchment).