In the observation tables provided in books and websites two different colors are assigned to a specific borax+salt bead in both oxidising and reducing flames. Not all basic radicals show this trend but some like Cu$^+$$^/$$^+$$^2$ does. It appears green in hot condition and blue in cold condition when made using oxidising flame.

My question is what is done to actually reduce the temperature of the borax bead? Is it held under running tap of water or just outside the flame?

• "In hot" and "In cold" are really weird column headings to me. It would seem better to use "While Hot" for column and move that column to the left. Use "Cold" for the second column. You of course have to fuse the bead before you can see the "Cold" color. – MaxW Sep 21 '16 at 17:25
• The table is from ncert. By 'in cold' and 'in hot' they must have meant in hot condition and cold condition respectively. – Tyto alba Sep 21 '16 at 17:42
• I know what Borax bead tests are so I understand what the author meant. I just think the notion was phrased poorly. Also since we read left to right there is the nuance of time. I think having the hot column first then the cold column would imply time sequence better. – MaxW Sep 21 '16 at 17:49
• @tytoalba where did you find this table? I couldn't find it in ncert class 11 – evamPUNdit May 11 at 16:02