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

[Rosie Scrimizzi]

concentrated formaldehyde is 37-40% w/v so 10% formalin is 3.7-4% w/v.........same thing......

yes......oh dear!!

> From: chapcl <@t> yahoo.com
> Date: Wed, 5 Oct 2011 16:05:31 -0700
> To: histotech411 <@t> gmail.com
> Subject: Re: [Histonet] Difference between Neutral Buffered Formalin 10% and	NB formaldehyde 3.7 to 4%
> CC: histonet <@t> lists.utsouthwestern.edu
> 
> Oh dear. Yes they are the same. 
> 
> Sent from my iPhone
> 
> On Oct 5, 2011, at 4:03 PM, Jenny Vega <histotech411 <@t> gmail.com> wrote:
> 
> > 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
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