(Sarah of the Clue Crew gives the clue.) We've rubbed the pigment of a radish on these cards; lemon juice turns the pigment orange, indicating that it's an acid; milk of magnesia turns it blue, indicating that it's this
While in medicine we have the plurality of causes and the 
singularity of effect, ..... it is the business of the cross-examiner to shake your 
evidence and to turn it,... [DOC] [TLE] Full text of "Popular science news, formerly Boston journal of ... [PAR] Solidification of Gelatine and Its Uses Geological Observations in 1890 Giant, ..... 
but it undoubtedly indicates a closer connection "between what have been ...... 
upon eikonogen, forming a yel- low colored matter which turns red with water.