సిరా

సిరా (Ink) కలం మొదలైన వ్రాత పరికరాలలో ఉపయోగించే రంగు ద్రవం.

Bottles of ink from Germany

An ink is a liquid containing various pigments and/or dyes used for coloring a surface to produce an image, text, or design. Ink is used for drawing and/or writing with a pen, brush or quill. Thicker inks, in paste form, are used extensively in letterpress and lithographic printing.

Ink is a complex medium consisting of comprising solvents, pigments, dyes, resins, lubricants, solubilizers, surfactants, particulate matter, fluorescers, and other materials. The components of inks serve many purposes; the ink’s carrier, colorants, and other additives are used to control flow, thickness, and appearance of the ink when dry.