dr i have sent fourts b drops image as an attachment there was a red dot in a square at bottom of syrup bottle . what it indicates and please look at it and say wheter it can be used or it os expired. iam asking this because lastmonth i have bought fourts b drops it has green dot in a green colour square at bottom of bottle but this month the new bottle have red dot in a red square .please send what it indicates wheatet it can be used or not