MACD Color Trawler (by ChartArt)

This version of the MACD indicator is 'trawling' (checking) if the MACD histogram and the zero line crossing with the MACD line are both positive or negative. The idea behind this is to show areas with higher or lower risk.

Features:
1. Enable the bar color
2. Enable the background color
3. Change zero line value


FYI:

"The MACD-Histogram is an indicator of an indicator. In fact, MACD is also an indicator of an indicator. This means that the MACD-Histogram is the fourth derivative of price."

First derivative: 12-day EMA and 26-day EMA
Second derivative: MACD (12-day EMA less the 26-day EMA)
Third derivative: MACD signal line (9-day EMA of MACD)
Fourth derivative: MACD-Histogram (MACD less MACD signal line)

Source: stockcharts.com/school/doku.php?st=gerald+appel&id=chart_school:technical_indicators:macd-histogram