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Good thing I don't sell baits except to a few locals that swear by them. Though the dye last for years because of how one uses it: dipping or swabbing with a Q tip or pipe cleaner. Again, I've have over a half dozen bottles that have lasted over 10 years.
There was a company called Glomaster that produced dyes under the name Color-rite. I still have quite a few colors still good after all these years as well as Spike-It dyes. Too bad they had to shut down after Spike-It won a patent infringement law suit against them. The price was 1/3 less per bottle.
But one bad thing about dye is that some colors bleed into others which used to be common with certain color plastic baits years ago. I think most plastics today don't have the problem due to formulation and are colorfast, though some colors like red or purple may still stain chartreuse. Keeping all color separate is always a good idea as well as keeping lures protected from sunlight to prevent fading.