Formic acid is a corrosive liquid that can cause severe burns to the skin and eyes. When diluted with water, the concentration of formic acid is reduced, making it less corrosive. However, even dilute formic acid can still cause irritation to the skin and eyes.

The effects of formic acid on the skin depend on the concentration of the acid and the length of time it is in contact with the skin. Mild exposure to dilute formic acid can cause redness, itching, and burning. More severe exposure can cause blisters, skin damage, and scarring.

Formic acid can also cause eye irritation, including redness, watering, and burning. In severe cases, formic acid can cause corneal damage and vision loss.

If you come into contact with formic acid, it is important to flush the affected area with water for at least 15 minutes. If the acid has been ingested, do not induce vomiting. Drink plenty of water and seek medical attention immediately.

Here are some additional tips for handling formic acid safely:

* Wear protective clothing, including gloves, goggles, and a lab coat.

* Work in a well-ventilated area.

* Keep formic acid away from open flames and heat sources.

* Do not mix formic acid with other chemicals unless you are specifically instructed to do so.

* If you spill formic acid, clean it up immediately with water.

* Dispose of formic acid waste properly.

By following these safety precautions, you can help reduce the risk of injury from formic acid.