Quote Originally Posted by Ravenguard View Post
This is right... kinda. Just like the DEEPEN'er fruits that give + to one color and - to the other two colors, the LIGHTEN'er fruit works as its polor opposite.

If you go by color values, Ink Blue is indeed deeper than Soot black in terms of values being closer to zero. To achieve Soot Black, you'd need to feed the Chocobo a number off all three Deepen'er fruits (that give + to one color, and - to the other two). That will transform your bird into the Ink Blue, which then you'd need to feed it a very few trio of the Lighten'er fruits, which will raise all the values evenly up to the values which match closer to Soot Black.
I don't think you'd need to feed it a Pineapple to go from Ink to Soot because the blue level of soot is lower than ink. I'm trying something right now and will know in about an hour.