Hi there,
i hope its interesting for you guys, Merck GmbH has something called Sulfidogen. When its heated it generates H2S. Here is the way to make it yourself:
A porcelain pot with Paraffin is heated in a waterbath. When its molten sulfur is added and the stuff is stirred until it gets homogeneous. Then "Kieselgur" (diatomaceous earth/das Kieselgur i dont know the correct translation) is added. First the mixture appears "grießartig". After some more minutes stirring and heating it gets viscous. then you can stop heating and let it cool down. it geta an yellow/Gray pasta at 30-40°C its gooey. at 20°C it is a hard prudish stuff. you can heat it a bit (to 40°C) an form small balls of it, with a wight of 0,5g. 0,5g of it heated to 170°C will produce 120mg H2S so it is easy to calculate the needed ammount. The gas is anhydous and do not need any futher cleaning.
Edit:25 : 15 : 7
Paraffin : Sulfur : Kieselgur
Wattebausch = glasswool
Füllmasse aus paraffin Schwefelblüte = the above made substance
Thats it.
Got that from:
Jander / Blasius Preperative Anorganische chemie.
If anyone want the scanned pictures pm me.
as i think the "Kipp" apparature is used by most of people here i dont post the pic/ref. it uses HCl+FeS = H2S then cleaned through H2O and H2SO4. But i think that is well documented.
Edit:here are the original scanned pages:
http://www.geocities.com/waaaaxity/Bild2.jpg
http://www.geocities.com/waaaaxity/Bild1.jpg
http://www.geocities.com/waaaaxity/Bild3.jpg