Hi, idk if this is normal but I can't remove the concrete, I try with the deconstruction planner or I try to place normal concrete on it but if I remove the concrete the colored concrete will reappear.
http://prntscr.com/v0w3kt
https://gfycat.com/fr/agitatedtestyhart

Do you have a save?

my save https://mega.nz/file/t54g1LAK#ux5_CYof_EclG7RPiNTaGKGcFJaEAC0z8qinQ5bskQQ

So after verification, you are not using my version of the mod where I could not reproduce the bug but the "Fixed" version that only add bugs...
I already asked the mod author to change the mod name but with no response (https://mods.factorio.com/mod/Concrete-Tints-Fixed/discussion/5f75cc10fd8a1c6384a9b8c4)

Can you change the version and tell me if you still observe said bug?

i have changed and its good now thank you.