Extender (ink)
{{Short description|Transparent material added to printing inks}}
An extender, also known as a filler,
{{Citation
| last = Chatfield
| first = H. W.
| contribution = Extenders
| year = 1962
| title = The Science of Surface Coatings
| editor-last = Chatfield
| editor-first = H. W.
| pages = 201–226
| place = London
| publisher = Ernest Benn Limited
}} in printing ink technology is a white transparent, or semi-transparent, component whose purpose is to reduce the cost of the ink, by increasing the area covered by a given weight of pigment.
{{cite book
| last = Apps
| first = E. A.
| title = Printing Ink Technology
| publisher = Leonard Hill Books ltd
| year = 1958
| location = London
| url =https://archive.org/details/printinginktechn00apps
| url-access = registration
}}
They generally have little colouring power.
Composition and properties
Use
Extenders primarily serve to reduce the cost of the ink, but can also impart useful properties to it. They can reduce the colour strength of the ink without adding any white colour to it, which is useful if the pigment in the ink is very tinctorially strong. Extenders can also be used to adjust the ink's consistency and viscosity.
References
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