4.)How could you communicate, over the mobile, to someone they may be allergic to a food color dye?

4.)How could you communicate, over the mobile, to someone they may be allergic to a food color dye?
"Hello (insert name), you may be allergic to a food color or dye." ;)
"your allergic to a food color dye"
Hey Tabi, What's wrong with wise saying it just as you did within your question?
speak, You may be allergic to a food color dye.
Just tell them. By the instrument, do you have any impression which color? My daughter is allergic to yellow #5, but adjectives the other dyes are OK.