Hi Mark I guess that's one of the differences in American and European treatment of hazardous substances - We in Europe assume there's *no safe concentration* for possibly carcinogenic substances, and we avoid them whenever there's a reasonable replacement.I whish I'd find a current reasonable European SDS for Cobalt-based Blue Silika Gel, but it has totally disappeared from the market, beside some obscure china imports - I only found one from Merck before the GHS-era, and back then it was marked as" T "(oxic) with "R49: May cause cancer in case of inhalation". So even if it's legal in the US, I'd still recommend against it. Martin Am 13.05.2016 um 20:22 schrieb Mark Mazer: > Blue silica gel MSDS: > http://catalog.adcoa.net/Asset/… > > Walmart and several nationwide crafts store chains still carry it for > flower drying in the US. > > I simply use the food dehydrator these days. > > Mark Mazer > Hertford, NC > USDA 8a > > > > 2016-05-13 19:19 GMT+02:00 Garak <garak@code-garak.de>: > >>> Hi James, >>> >>> thank you for this page of valuable information. One little comment: You >>> recommend blue silica gel to dry pollen. this uses Cobalt(II) chloride as >>> humidity indicator, which was identified as highly carcinogenic in recent >>> years. It (hopefully) should be difficult to obtain now and I strongly >>> recommend anyone to give any remaining leftovers of blue silica gel to a >>> professional disposal service, as there are several non-toxic >> alternatives. >>> -- >>> Martin >>> ---------------------------------------------- >>> Southern Germany >>> Likely zone 7a >>> >>> >>> >>> Am 13.05.2016 um 18:44 schrieb James SHIELDS: >>> >>>> I put this page together years back on storing pollen: >>>> >>>> http://www.shieldsgardens.com/info/Pollen.html >>>> >>>> -- Jim >>>> >>>> On Fri, May 13, 2016 at 12:33 PM, Michael Mace <michaelcmace@gmail.com> >>>> wrote: >>>> >>> _______________________________________________ >>> pbs mailing list >>> pbs@lists.ibiblio.org >>> http://pacificbulbsociety.org/list.php >>> http://pacificbulbsociety.org/pbswiki/ >>> >> _______________________________________________ >> pbs mailing list >> pbs@lists.ibiblio.org >> http://pacificbulbsociety.org/list.php >> http://pacificbulbsociety.org/pbswiki/ >> > _______________________________________________ > pbs mailing list > pbs@lists.ibiblio.org > http://pacificbulbsociety.org/list.php > http://pacificbulbsociety.org/pbswiki/ -- Martin ---------------------------------------------- Southern Germany Likely zone 7a