A very basic script that changes the background color of the chart to Green if the price closes over the previous day close, and to Red if the price closes under the previous day close. This allows you to easily see if it is currently a Bull or Bear market with a glance. Alerts added.
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 publications is governed by House rules. You can favorite it to use it on a chart.
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