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How to make a wonderful blue line?
1. Open Tik Tok and click the search bar.

2. Enter the blue line effect in the search bar.

3. Click the blue line special effect input options.

4. Click the Blue Line Challenge option.

5. Click the option button to participate now.

6. Enter the shooting interface, click on the props and find the blue line special effect.

7. The above is how to get the wonderful blue line.