I was busy in my creative world, trying to create a display of dyed leather for a shop, when I noticed that my pink dyed leather helmet came up as white on the armor stand. I originally thought that it was just a minor glitch for the world, and that world only, so I exited the world and logged back in. When I returned though, it was still fully white. I took it back off and put it on my head and it was pink. I thought that maybe it was just the world itself, so I decided to go to my survival world where I knew I had a suit of dyed leather armor. I got into the world and went to the armor stand and it was all white. Do double check that it wasn't just me I had my friend come into the world and check it out. They put it on and said that it was black in their inventory, but then they put it on the armor stand and it was white. In conclusion, we came to realize that it was a bug and not anything we could physically fix ourselves. They had no account to do this write-up, so taking notes that they tested in their own worlds and my own notes I came up with this description. My friend is very upset about this! They have this one world with armor stands as humans in her "village", so to log in and find all of the different colors turned to white she was devastated. I hope that this can be fixed. 

   By the way, they wouldn't allow me to put this up in the version, but the version is actually 1.12 not 1.14.4. Hope this helps.