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change font on volume indicator to be same size as tick labels on the beaker
update
12/3/13 when a diluted solution reads '7.00' on the pH meter, use water color
12/3/13 internal refactoring of Solution model, moved some functions to prototype, made color derived from solute and pH
12/3/13 use water color as the 'diluted' color for all solutions, as shown in the design doc
12/3/13 change colors of milk and spit, as shown in the design doc