Three themes to scrutinize as we settle back into a full trading week are weakness in grains, 30-year bonds and 10-year Treasuries failing to confirm weakness in stock index futures, and potential multiday reversals in softs contracts. Corn and wheat have been in downtrends since spiking in September, but beans have remained resilient. Now the bean complex is showing signs of reversing: March soybean oil (BOH3:CBOT) logged a top reversal bar Monday and is confirming an important turnaround may be at hand by following through to the downside in Tuesday's session. Here's the pattern. On Friday, bean oil rallied to a new contract high, but was unable to sustain the gains, closing at opening levels, which was the low of the shortened session, in a candlestick known as a graveyard Doji. The Doji denotes a potential change in the trend. On Monday, bean oil completely engulfed Friday's Doji, tracing an outside bar down in a convincing reversal bar formation. Early in Tuesday's session, we saw downside follow-through, price action that works to confirm the reversal pattern. The swift reversal from contract highs leaves bean oil in the lower tranch of its November consolidation and suggests this market has put in an intermediate-term top. Corn has been under pressure since tracing its own graveyard Doji candlestick on Sept. 9 and has also been suffering from levels of aflatoxin contamination considered unsafe by the U.S. Department of Agriculture. One of the weakest things a market can do is begin a session on its high and end on its low of the day. March corn (CH3:CBOT) has done this consistently lately, closing on its lows (or below the midpoint) for the past six sessions. Also notice that the 20-day simple moving average has contained any pullbacks from the low.