Engulfings for bullish and bearish candles. Default is to compare to 20MA, but that is configurable. Bullish make white candles, bearish makes black candles. If the engulfing is against the direction of the MA, or if open and close are on opposite sides of the MA, the candles turn gray.
Open-source script
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules.
You can favorite it to use it on a chart.
Disclaimer
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