Lingering Potion

Lingering Potions are a variant of potions that can be thrown and linger on the ground.

Brewing
Since splash potions cannot currently be placed into a brewing stand (MC-83658), lingering potions can only be made by leaving the splash potion in the stand after brewing it.

Usage
Lingering Potions are thrown, like splash potions, by them. On impact they explode, creating a cloud. The cloud is made up of the potion particles corresponding to the potion that was thrown.

The cloud starts with a radius of 3 blocks, decreasing to 0 over the course of 30 seconds. During the time the cloud is there, any player or mob that walks into it after the first second will get the corresponding status effect; this decreases the radius by 0.5 block immediately, causing the cloud to disappear more quickly.

For effects with duration, the duration applied by the cloud is $1/4$ that of the corresponding potion. For effects without duration such as Healing or Harming, the potency of the effect is $1/2$ that of the corresponding potion.

Lingering Potions can also be thrown out of dispensers in the same way as splash potions. As of 15w33a both of these potions are thrown farther from dispensers, more like snowballs.