Three to four instead of one millilitre of formalin.
Ebisawa
I
I
D004168:Diphtheria Toxoid / Q000266:history* / Q000633:toxicity; D005557:Formaldehyde / Q000266:history; D049673:History, 20th Century
D004168:Diphtheria Toxoid; D005557:Formaldehyde