
1) Aged 2) Discoloration 3) Staining
Found on
https://www.crosswordclues.com/clue/yellowing

1) Discolouring
Found on
https://www.crosswordclues.com/clue/yellowing

A symptom characterized by the turning yellow of plant tissues that were once green.
Found on
http://ppathw3.cals.cornell.edu/glossary/Defs_Y.htm

• (p. pr. & vb. n.) of Yellow • (n.) The act or process of making yellow.
Found on
http://thinkexist.com/dictionary/meaning/yellowing/

Most commonly associated with white and solvent-based paint, this inherent effect occurs with age and is due to the presence of alkyd resins, a key component. The paint film goes yellow over time, caused by a chemical reaction within the alkyd. UV light from sun rays will slow the reaction down, but not stop it. Using a varnish can reduce this prob...
Found on
http://www.encyclo.co.uk/local/20471

Gradual colour change in the original appearance of a P.S. label, characterized by the development of yellowish and brownish hues.
Found on
http://www.encyclo.co.uk/local/20829

Development of a yellow color or cast in white, a pastel, colored or clear finishes.
Found on
http://www.encyclo.co.uk/local/21452

Development of a yellow color or cast in white, a pastel, colored or clear finishes.
Found on
http://www.encyclo.co.uk/local/22428
Yel'low·ing noun The act or process of making yellow. « Softened . . . by the
yellowing which time has given.»
G. Eliot. Found on
http://www.encyclo.co.uk/webster/Y/4

This effect on oil paintings is usually caused by one of three reasons: excessive use of linseed oil medium; applying any of the varnishes that are prone to yellow with age; or most often – an accumulation of dirt embedded into the varnish.
Found on
http://www.modernsculpture.com/glossary.htm

This effect on oil paintings is usually caused by one of three reasons: excessive use of linseed oil medium; applying any of the varnishes that are prone to yellow with age; or most often - an accumulation of dirt embedded into the varnish.
Found on
http://www.rexart.com/glossary.html

General term for the yellowish discoloration of the leaves of the vine. This can have a variety of causes such as a lack of nutrients (for example manganese) or as a consequence of diseases. Viruses as well as insects(cicadas) can appear as pathogens or carriers: Chlorosis (jaundice) Flavescence dorée (golden yellowing) Brushwood disease Blac...
Found on
https://glossary.wein.plus/yellowing

A coating defect consisting of a physical change of a coating in which the color of the cured coating gets yellower as it ages, or after rebaking.
Found on
https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/

Development of a yellow color or cast in white, a pastel, colored or clear finishes.
Found on
https://www.encyclo.co.uk/local/21303

There are many reasons to cause yellow leaves on plants
Found on
https://www.encyclo.co.uk/local/23353

There are many reasons to cause yellow leaves on plants
Found on
https://www.encyclo.co.uk/local/23362
No exact match found.