Labels are directly placed onto a blood bag by the blood bag manufacturer and display information such as the manufacturer's name and address, as well as batch numbers and product codes to allow traceability. Additional primary labels are also used at the processing facility, for example at a blood bank or within the hospital. Once blood collection has taken place blood bags must be labelled and barcoded with important information such as the blood type and donor number. The adhesive used on such labels must not alter the composition of the blood products or damage them.