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Improved version per Edward’s suggestions Here are 6 videos of Dawn Pro bubbles changing colour as they are

Dp40a-0

Dp40a-0

40:1 pH unadjusted

inflated. For each video all 7 bubbles are the same mix. 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 (12 cm on the scale is equivalent to 1 litre of volume). I'm no expert on colours so I'm looking for advice.

The 6 mixes are all Dawn Pro/distilled water. pH was adjusted with HCl.

Dp40b-0

Dp40b-0

40:1 pH 7.6

1) 40:1, pH not adjusted

2) 40:1, pH 7.6

3) 20:1, pH not adjusted

5) 20:1, pH 7.6

6) 12:1, pH not adjusted

7) 12:1, pH 7.6

Dp20a-0

Dp20a-0

20:1 pH unadjusted

I’ve let each video run until the last bubble burst, to give an idea of reproducibility. If you do the statistics (mean, standard deviation, standard error) you’ll find that 5 to 7 repeats should yield fairly robust data.

Dp20b

Dp20b

20:1 pH 7.6

Dp12a

Dp12a

12;1 pH unadjusted

Dp12b

Dp12b

12:1 pH 7.6