I just found this group and hopefully I can gain some insight into why one of my products begins a light cream color, then slowly transitions to pink then purple then full on blue. My formulation uses zinc oxide which I know has a thermal reaction and turns yellow, then white upon cooling. I think it may be that factor combined with the addition of the plant extracts, all natural preservatives and the dead sea salts. I can't figure it out and I could use some help before I try to market a blue deodorant as all natural.
I attached before and after pictures.