The hair float test is notoriously unreliable. But, yes, coloring does affect porosity, and it is possible to have more than one type of hair on your head. New growth, for example, is different from damaged old growth.
2C-3A/ Coarse/ Normal to high porosity/ SW Florida
Wash: CJ Daily Fix, AIA Coco Cowash, Trader Joe's TTT condish, Shea Moisture MRS
CO: CJ Smoothing, Curly Kinks Renew, Darcy's Pumpkin, CJ Curl Rehab, Regis Olive Oil
Enhancers: Okra gel, FSG, Uncle Funky's CM, CJ Pattern Pusha, KMF Upper Mgmt
I always top with a gel: MGA sculpting, Giovanni LAN, Spiral Solutions FHG, JC Spiralicious
Other loves: Coconut oil soaks & pre poo, Jane Carter N&S