Hot Copper Charting and Chat, page-166

I know hindsight is wise @wilfran1pm and I'm not sure I would've picked it but the bar before the one on the 21/9 gave a warning - it was high volume but low spread - all that effort and no result. It indicated weakness in the uptrend and sure enough even though the next bar was green with large vol. the trend did not continue, you would have to assume there was hidden selling in that bar of 21/9.