tal·low
/ˈtalō/ noun
a hard fatty substance made from rendered animal fat, used in making candles and soap.
Labeling requirements for pure soap (not M&P) only require the following on the label:
The word "soap", net wt (U.S. & metric), required contact info.
I have to question, why bother putting ingredients on the label? The only downfall I see is those with specific allergies or who have religious limitations may not be your customer.