Drop 1-2 drops of this test agent into 10ml of tap water, identify colour of the water samples within one minute (Yellow means "positive" chlorine reading).

Keep at room temperature, dry & cool place, avoiding sunlight.

[Precautions]
1. Do not drink;
2. Keep away from high temperture;
3. Keep out from children;
4. Do not contact the eyes, if contacted, wash with water immediately, in serious cases, please seek for medical attention immediately.