To brew a mixed potion you’re going to need Awkward Potions and a Turtle Shell. There’s currently only one mixed potion that can be brewed.
Mixed potions have both positive and negative effects when thrown. Potion of Poison + Potion of Healing + Fermented Spider Eye = Potion of Harming (Instantly does six hearts of damage).Potion of Swiftness + Potion of Leaping + Fermented Spider Eye = Potion of Slowness (Players speed will slow down by 85% for a minute and thirty seconds).Potion of Weakness + Redstone Dust = Extended Potion of Weakness (Damage dealt is halved for four minutes).Extended Mundane Potion + Fermented Spider Eyes = Extended Potion of Weakness (Damage dealt is halved for four minutes).Mundane Potion + Fermented Spider Eyes = Potion of Weakness (Damage dealt is halved for a minute and a half).Thick Potion + Fermented Spider Eyes = Potion of Weakness (Damage dealt is halved for a minute and a half).Awkward Potion + Spider Eye = Potion of Poison (Poisong the player for forty five seconds, reducing his health to a maximum of 1/2 heart).Here is a list of all negative secondary potion recipes in Minecraft: Negative All negative potions are brewed using either the Awkward Potions, the Mundane Potion,the Thick Potion, the primary Potion of Weakness or the Extended Mundane Potion. Awkward Potion + Phantom Membrane =Potion of Slow Falling(Causes the player to fall at a slower rate for a minute and thirty seconds).Awkward Potion + Rabbit's Foot =Potion of Leaping (Increase jump height by half a block for three minutes).Awkward Potion + Sugar = Potion of Swiftness (Increases movement speed and jump height for three minutes).Awkward Potion + Blaze Powder = Potion of Strength (Increases damage by a heart and a half for three minutes).Awkward Potion + Ghast Tears = Potion of Regeneration (Restores health over 45 second).