I just purchased a set of glass fritted buchner funnel but several of them are badly colored. it got even more discolored after filtering a hot
solution of badly contaminated pottery grade potassium nitrate -- dark amber solution.![:(](./images/smilies/sad.gif)
I tried to clean it with hydrochloric acid, then tried hydrogen peroxide as suggested by arthur dent, then sodium metabisulfite, then acetone, then
isoprophyl alcohol, but nothing. ![:mad:](./images/smilies/mad.gif)
I wonder if the fine particles that is stuck in the frit is carbon and if so how can you remove carbon... isn't it next to impossible? ![:o](./images/smilies/shocked.gif)
Any help would be appreciated. thanks. |