Colours1
As suggested by Edward, here is a video of Dawn Pro bubbles changing colour as they are inflated. I've made some improvements to the lighting so I hope it's satisfactory. The purpose is to identify the bubble size which is most representative of in vivo bubbles made with a tri-string loop. The position indicator on the right gives a measure of the bubble volumes. I'm no expert on colours so I'm looking for advice.
The mixes are all Dawn Pro/distilled water. pH was adjusted with HCl.
Strength/pH for each bubble:
1) 40:1, pH not adjusted
2) 40:1, pH 7.6
3) 20:1, pH not adjusted
4) not used
5) 20:1, pH 7.6
6) 12:1, pH not adjusted
7) 12:1, pH 7.6
(ps: the bubbles start inflating when the position indicator is at 3cm. 12cm of displacement is equivalent to 1L of volume).