What do you mean by Olfactory Indicators ?
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An olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution. ... There are certain substances whose odour (smell)changes in acidic or basic solutions. These substances are called olfactory indicators. The olfactory indicators have a characteristics odour.
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ᴏʟꜰᴀᴄᴛᴏʀʏ ɪɴᴅɪᴄᴀᴛᴏʀ:-
ᴀɴ ᴏʟꜰᴀᴄᴛᴏʀʏ ɪɴᴅɪᴄᴀᴛᴏʀ ɪꜱ ᴀ ꜱᴜʙꜱᴛᴀɴᴄᴇ ᴡʜᴏꜱᴇ ꜱᴍᴇʟʟ ᴠᴀʀɪᴇꜱ ᴅᴇᴘᴇɴᴅɪɴɢ ᴏɴ ᴡʜᴇᴛʜᴇʀ ɪᴛ ɪꜱ ᴍɪxᴇᴅ ᴡɪᴛʜ ᴀɴ ᴀᴄɪᴅɪᴄ ᴏʀ ʙᴀꜱɪᴄ ꜱᴏʟᴜᴛɪᴏɴ. ᴛʜᴇꜱᴇ ᴛʏᴘᴇ ᴏꜰ ɪɴᴅɪᴄᴀᴛᴏʀꜱ ᴀʀᴇ ᴜꜱᴇᴅ ɪɴ ʟᴀʙᴏʀᴀᴛᴏʀɪᴇꜱ ᴛᴏ ᴄʜᴇᴄᴋ ᴡʜᴇᴛʜᴇʀ ᴀ ɢɪᴠᴇɴ ꜱᴏʟᴜᴛɪᴏɴ ɪꜱ ᴀ ʙᴀꜱɪᴄ ᴏʀ ᴀɴ ᴀᴄɪᴅɪᴄ ꜱᴏʟᴜᴛɪᴏɴ ʙʏ ᴀ ᴘʀᴏᴄᴇꜱꜱ ᴋɴᴏᴡɴ ᴀꜱ ᴏʟꜰᴀᴄᴛᴏʀʏ ᴛɪᴛʀᴀᴛɪᴏɴ.
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