Sall, being a simpleton, I look for the simple things in life. Volume is a complex subject and there are some members that know far far more than I do. To answer your question..... On normal charts, ( most in fact) you cannot separate out buy and sell volumes. A n attempt is made to allocate volume( as if it were simulating buyer and seller volume) as follows:- If the current price bar is an up tick, then volume is shown as "all buyers". If the current tick is a down bar, then the volume is shown as "all sellers". We KNOW this can't be right as there has to be a buyer for each seller. However, I find it useful ( although contradictory) to show these as two separate coloured volume bars. I'll get slated for this...... because it goes against all common sense and everyone will tell you it shouldn't be done.Anyway, I find it easy to recognise certain volume patterns this way and I understand what I see( from a limited perspective). In this way I can see volume confirmations of divergence ( when they occur) and volume peaks at tops and bottom. Admittedly, I wouldn't need the two colours to see the volume peaks though. The three main things I look for are confirmation of a PD bottom, where I will see 3 lower lows on volume corresponding to 3 lower lows in price.This is cross referenced to the 3 pk PD .If you match the two up, the chances are you're at a substantial bottom reversal. The second is a general down trend in volume overall ( buys and sells) diminishing to almost zero. This often precedes a price move. Why? because the MM's need volume to earn a living. When it dries up, they have to shift the price one way or the other to precipitate some action.( simplistic view , I know). Thirdly, Volume peaks where you get a spike of >3 times the near current average. This ai almost always a reversal point.Hope that helps.