A bottle containing 5gms of pH indicator
circa 1960
A bottle containing about 10 gms of haematoxylin pH indicator made by Griffin & George Limited
circa 1960
A bottle containing 5gms of pH indicator
circa 1960
A bottle containing 5gms of pH indicator
circa 1960
A 100ml bottle of Alkaline methylene blue
circa 1960
A bottle containing 5gms of pH indicator
circa 1960
A metal vial containing 5gm of pH indicator
circa 1960
A vial containing 1gm of pH indicator
circa 1960
A vial containing 1gm of pH indicator
circa 1960
A bottle containing 5gms of pH indicator
circa 1960
A bottle containing 25 gms of Ehrlich Haematoxylin
circa 1960