Lake dyes give the best color performance in bath bomb type products. They create beautifully colored water and do not leave a mess in the tub.  What you see is what you get in the bath bomb mix.  I also use the lakes in my bubble bath, sugar scrub, lip balms and bubble scoops.  Briliant colors in all products using very little.
 
Yellow #5 lake dye and Blue #1 lake dye blended together for the perfect Kelly green.  These are high dye lakes that arrive batch certified from the factory.  After they arrive in big drums, we rebag the lakes into 1 oz sizes.  I am not a certified rebagger.
 
  Bags are a lot less expensive than jars to ship .Jars are much heavier and bulkier for shipment.  I sell the lakes in bags because it is so much cheaper to ship and keep your costs down.  I could also easily get certified as a rebagger.  I do exactly the same that the certified baggers do.  I rebag batch certified lakes (This means they are deemed pure by the FDA once already.) into bags in a very clean environment.  I also wipe down all bags with rubbing alcohol to remove any residue.  But getting all the colors retested costs a lot and raises the prices.  The way I do my thang, saves you a lot of money on the best quality lakes out there.  After I talked to the head of Colors in Washington DC a few years ago, the blends do keep their certification.  So order a blend if you want batch certified.  If you want the best lake colors, I have them for close to half price or better.  If it says I have it in stock on the website, it is already in stock and ready to ship fast.