A simple script help you identify significant upticks in volume for a particular candle.
Using the standard z-score calculation you can change the bar color based on the user selected standard deviation range.
Calculation
z = (x - μ) / σ, where:
z: is the z-score
x: is the current volume
μ: is the mean volume
σ: is the standard deviation
Options include setting the bottom and top end of the deviation range. This will allow you to see a moderated uptick in volume as well as an extreme uptick. You can also choose the colors for the moderate bull/bear volume and extreme bull/bear volume.