Markets generally do not exceed the upper or lower Bollinger band lines for long and gold needs to revert back to some equilibrium pricing.

FORBES: Technical Trading: Gold Prices Ripe for Consolidation near Term

In March and April, there were several instances when SLV closed above the upper Bollinger band, but there was little follow through to the upside.

FORBES: Gain an Edge with Volatility Analysis

In fact, during the most recent rally, Immersion has been walking the upper bollinger band (10-period setting) for the most part, affirming that the trend may continue.

FORBES: Getting Good Feelings About Immersion

The blue lines on the chart above represent the Bollinger bands, and below the bar chart, I have plotted the band width indicator.

FORBES: Gain an Edge with Volatility Analysis

The upper Bollinger prices are stalling (1.3089), but with day charts heading north a push through the band is reasonably possible.

FORBES: Euro Has Upside Here, But Beware The Tricks Of The Season