A new method of seeding clouds with salt particles was developed in a computer model to study how it affects rainfall. By adding salt particles to the model, researchers found that a moderate amount of seeding can increase rainfall by 10%, but too much salt can actually reduce rainfall. The timing of the seeding also plays a role in how effective it is, with negative effects appearing towards the end of the rain. Salt seeding not only impacts warm clouds but also affects the formation of graupel and cold rain.