On immersion in a bath of chromic acid the bared surfaces are bitten into, while the unexposed parts remain unaffected. [Please select]
0
Some dye-stuffs, such as logwood for blacks, work best when the wool is mordanted with chromic acid, which is effected when sulphuric acid is the assistant mordant. [Please select]
Do you have a better example in your mind? Please submit your sentence!