Fruit juices are effective against gastritis. Spinach and carrot juice, twice a day helps. Pumpkin juice for a month or two is helpful, when taken in an empty stomach. Foods that cause gas, such as broccoli, cabbage, peas, onion, dried beans and so on are harmful to the stomach.
Sodium hydroxide is a powerful chemical with many aliases: NaOH, lye and caustic soda. Sodium hydroxide is often the active agent in cleaning solutions, but it is also used in the manufacturing of products like textiles, cellophane and paper. This chemical can be very dangerous and can severely damage materials.
Lye is a caustic, alkaline chemical that is useful for many purposes but also is hazardous. It can dissolve sticky substances such as fat and has a high degree of reactivity with other materials. Modern lye typically is the chemical sodium hydroxide, but potassium hydroxide was once the chemical compound that was commonly used. Whether in a flake, granular or liquid form, it is very dangerous and can cause damage to surfaces and people.