I went to the barber shop, it is in a middle class locality where generally one barber cuts hair every half an hour. I did shaving there and in the end he sprinkled some water on Alum block and applied that on my small 2-3 cuts on the chin. Cut was too small and only very tiny dot of blood was visible. I am in super worry, that this block must have been used on other customer for bleeding. I didn't check the alum cube after/before it was applied on me. He used a new razor blade but I'm worried about HIV transmission chances because the alum applied on my cuts. Do you feel there are any chances? Or is HIV virus fragile and does not live in water or on alum?