hi Gayle,

been using Whatman #4 for a years, and have never seen a DAB precipitant on
my sections.  i'm using the Sigma 10mg tablets, in a 7.6 TRIS buffer, and
put the solution on a rocker for at least 30 minutes before i add nickle
chloride and peroxide, then filter. even after rocking there is still some
of the tablet that has not completely gone into solution, but when i add my
nickle chloride and vortex, the solution becomes clear, and a light,
transparent, green.  

rob


At 10:01 AM 8/11/99 -0600, Gayle Callis wrote:
>Just curious, what are people using to filter DAB before applying to 
>tissue sections?  Microfilters, non sterile variety, for syringes? 
>or just a filter paper, # of filter paper please, ie Whatman # or 
>an equivalent. 
>
>this is for a very small amount of DAB, 2.5 mls frequently.  
>
>Gayle Callis
>