Are there any industry resources for identifying Gluten Free ingredients ?
I have checked my ingredients on Google, but can I state "gluten free" ?
Could there be residual hidden gluten in any of my purchased ingredients ?
Gluten is found in wheat, rye, barley and some oats. All your oils are gluten free. What other ingredients are you using, and where are you located?
I am in the US so I can't speak to other countries' labeling laws, but you can rely on food labeled gluten free here. If you are putting oats in your soap, make sure you buy gluten free oats.
ETA: I don't sell so I don't know whether you can legally label your soap GF. However, I assume anyone who has celiac disease or extreme gluten sensitivity is accustomed to reading labels and would be able to tell from your ingredients whether your product is gluten free.