What property would you adjust to influence how quickly particles fade out in a Particle System?

Adjusting the Start Lifetime property in a Particle System directly influences how long each particle exists before it disappears, which effectively alters the rate at which particles fade out. The Start Lifetime determines the lifespan of the particles from the moment they are emitted until they are destroyed. By shortening this lifetime, particles will fade out more quickly, which can be particularly useful for creating effects like explosions or brief sparks.

On the other hand, the Gravity Modifier changes how gravity affects the particles, which can impact their movement but not their fading behavior. The Start Color affects the initial color of the particles, which can include transparency settings, but it does not control the duration of visibility. Max Particles simply sets a cap on how many particles can exist simultaneously within the system and does not influence their fading out duration.