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Russia Leather
- a smooth leather tanned with willow, birch, or oak, and scented on the flesh side with birch oil
Ratsbane
- a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer
Ratsbanes
- a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer
Rock Wool
- a light fibrous material used as an insulator
- a light fibrous material used as an insulator
Royal Jelly
- a secretion of the pharyngeal glands of bees that is fed to very young larvae and to bees destined to be queens
- a secretion of the pharyngeal glands of bees that is fed to very young larvae and to bees destined to be queens
Reagent
- a chemical agent for use in chemical reactions
Reagents
- a chemical agent for use in chemical reactions
Reducing Agent
- a substance capable of bringing about the reduction of another substance as it itself is oxidized; used in photography to lessen the density of a negative or print by oxidizing some of the loose silver
- a substance capable of bringing about the reduction of another substance as it itself is oxidized; used in photography to lessen the density of a negative or print by oxidizing some of the slackened silver
Reductant
- a substance capable of bringing about the reduction of another substance as it itself is oxidized; used in photography to lessen the density of a negative or print by oxidizing some of the loose silver