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A good place to ask questions is in the kongregate chat for Esgrima 2. Though I DO agree with you, proper descriptions for items are seriously lacking.
To your question. The four different Dyes(Armor/Helmet/Clothing/Hat) are ingredients in several Recipes for crafting the elite gear. Dye usually sell in player shops for 5-10k each(though, you can sometimes find it for much less).
Hope that helped. Good luck and happy crafting :)