Rewrite the following by inserting appropriate word / words:
Starch iodide paper turns blue black in the presence of Chlorine.

Explanation

To rewrite the statement by inserting appropriate words, we can break down the process as follows:

1. **Identify the initial condition**: The starch iodide paper is initially colorless.
- **Insert**: "initially colorless"

2. **Describe the reaction**: When the starch iodide paper comes into contact with chlorine, a chemical reaction occurs.
- **Insert**: "reacts with chlorine"

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