scratches is a form of:

Preservative



noun
1.
(anything that preserver) អ្វីៗដែលបង្ការកុំអោយខូចពុកផ្អូម ជាដើម
adjective
1.
(preserving. Tending to preserve or capable of preserving) ដែលបង្ការ​កុំអោយខូចពុកផ្អូមជាដើម
ENGLISH MEANING
noun
1.
That which preserves, or has the power of preserving; a presevative agent.
adjective
1.
Having the power or quality of preserving; tending to preserve, or to keep from injury, decay, etc.
1.
conservative, protective, conservatory