An OCL forms when two candles of the same colour follow each other. The level sits where the first one closes and the second one opens. A bearish OCL acts as resistance and a bullish OCL acts as support.
Bearish OCL: two bear candles in a row. The join between them is the level price returns to.Bullish OCL: two bull candles in a row. The join becomes support.
Why it works
Two same-colour candles in a row mean price launched without pausing. Orders were left behind at the launch point, so price often comes back to it. On a lower timeframe this area usually looks like an order block, much like the "hidden base" in Smart Money Concepts.
Which OCLs matter
Same-colour pairs appear all the time. The OCL that matters starts a strong move, right after the candle before it changed colour, and ideally right after a liquidity sweep and a break of structure. An OCL in the middle of sideways chop means little.
Rules
Look for the first join of a strong same-colour run.
Prefer OCLs that formed after liquidity was taken.
Use OCL mostly on the higher timeframe (H1 and above). It is the anchor of the MSNR entry model.
Confirm the OCL with a lower-timeframe SNR, covered in Daily trend and timeframe pairs.
Common mistakes
Marking an OCL at every pair of same-colour candles.
Treating a lower-timeframe OCL inside a higher-timeframe OCL as strong. MSNR calls that the weaker combination.
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Study notes in my own words, based on the MSNR "Trading Secret Algorithm" and Alchemist (White) materials. Educational only, not financial advice. Practise on a demo account and with TradingView Bar Replay before risking real money.