Inverse

Inverse is a property that appears on Bloons TD 7. Bloons with this property will have a glow of its inverted color (e.g. an Inverse Pink Bloon would have a cyan glow, as shown). Also, every 5 seconds they will enter their inverted state, and lasts for 5 seconds before they turn back into normal. When on their inverted state, bloons with no immunities will be immune to EVERYTHING, not even towers under a Monkey Intelligence Bureau. However, bloons with immunities can be only popped by attacks that they are originally immune to. And to add to this, they have 2x speed! Inverse Bloons first appear on round 48, as 5 Inverse Lead Bloons, along with 15 Camo Lead Bloons!

Backstory
After some bloons found antimatter on their lab, they experiment with it, and turns out the antimatter fuses with them, causing half of the bloons turn into Inverse Bloons!

Trivia

 * The bloon's color is not fully inverted in its inverted state, instead its hue is changed to match with its inverted color.
 * However, if that bloon's color is monochromatic, then it would be inverted in its inverted state as normal.
 * I know, the Dael Bloon already exists, but the inverted state is temporary, and the bloon also have double speed boost.