ANSWER

Natural colour, Annatto Extract Color (E160b) could be added into the finished product (Solymosi et al., 2015).

Reference

Solymosi, K., Latruffe, N., Morant-Manceau, A., & Schoefs, B. (2015). Food colour additives of natural origin. Colour Additives For Foods And Beverages, 3-34. https://doi.org/10.1016/b978-1-78242-011-8.00001-5