Everstone, a Singapore headquartered investment group, has signed an agreement to acquire a controlling stake in Calibre, a specialty ingredients player focused on the pharmaceutical, nutritional and personal care segments. Founded in 1984 by Ranjit Bhavnani, Calibre is a leading specialty ingredients player in Iodine Derivatives, Persulfates and Perchlorates. Calibre’s customers span across US, Europe,…