[Histonet] Difference between Neutral Buffered Formalin 10% and NB formaldehyde 3.7 to 4%

[Jenny Vega]

Ok I want to know the diferrence between Neutral Buffered Formalin 10% and
NB formaldehyde 3.7 to 4% . I was taugh at college that they were the same
thing and in the book from Frieda Carson it says that but my supervisor
swears they are different chemicals. In the laboratory she has used 10%
neutral buffered formalin all the time, but when we ran out of it  we were
sent NB formaldehyde 3.7 to 4 %she sent it back and we were sent NB
formaldehyde 3.7 to 4% once again. She says that 10% NBF is more
concentrated and pure than 3.7 to 4 % formaldehyde and that the tissues are
going to  putrefied if they are put in that solution.

Am I wrong or is she wrong? thanks