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Message:: [QUOTE="tracy5900, post: 109582, member: 4560"]to gdjmsp can i put 4 -40 gram silica pack at the same time for re-activation?  or i should put inside there longer time than three hours for four packs?.  the reason is that it will save some electricity bill.  each time you use 3 hours on an oven at 300 degree will cost you at least 0.75 electricity bill in new york.  that is the same cost of one silica gel.  sorry i usually use the word silicon instead of silica. i discovered that by using sandwich bag to cover every coin holder or capsule or sleeves.  it works too.  all my coins were inserted with sandwich bag (non chemical sandwich bag).  for fifteen to twenty years.  all my coins were still brilliant.  except 25 coin of my 1992 american eagle proof dollars where i mistakenly used plastic bubble (for protecting things inside a cartoon box).  those coins were easily gets black spot.  and i took out those original eagle holders out to save space.  that's another big mistake. many year before,  when i started to collect coins. i also got sticky materials from inserting most of my circulated silver dollar coins inside the pvc 2 x 2 holders.  well, those time really no body knew that.  same happened to stamp collectors.  that we used to insert old stamps with sticker or glue and attached to the stamps booklet.  it destroyed all the collection.[/QUOTE]