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If you're trying to save on space, the only way I can think of is quite a bit of work compared to the Hair Binner, honestly. You would need to delete three of the family's gray textures, then edit each Material Definition in
SimPE to redirect the gray hair to look at the remaining file. You would not need to edit the One Chosen Gray hair.
CatofEvilGenius wrote a tutorial on this kind of method for skintones, but theoretically, it should work for hairs, too. She broke down the relationship between the Material Definition resource and the Texture image excellently.
In summary:
*Backup your files in case anything goes wrong.
*You want to delete the grays in three out of four of your families. It's a good idea if you bin them with the Hair Binner first, then go delete the spare gray hairs.
*Read Cat's tutorial to until you feel comfortable attempting the steps.
*When you get to Step 3 of Removing Redundant Textures, open up the file that still has its gray hair. Find the gray hair's file name, copy it, then edit the Material Definitions in the three other families that are currently missing their gray hairs.
*I think you would skip Step 4 in this case.
Let me know if this works or not. I haven't tried it, so I'm not sure if I'm pointing you in the right direction.