Making a Lead garden pot
Water (7%)= 35.95 salt, 13.88 merc, 13.16 sulpher, 37.01 lead 
Lime (7%)= 14.09 salt, 18.93 merc, 21.95 sulpher, 45.05 lead
[First clue something is up] Milk Lime (6%)= salt 35.73, merc 13.93, sulpher 13.24, Lead 37.09
Garden Pot using same values for lime and milk lime above... mixed with 
Granite (8%)= 17.61 salt, 22.56 merc, 14.14 sulpher, 45.70 lead
8x6%+1x7%+1x8%= Lead Garden pot (5%); 22.70 salt, 17.93 merc, 16.55 sulpher, and 42.83 lead
Seems water has a lot more do it with it than anything else... ??? 
However... I'd at least hoped for a 6% pot... how does it drop all the way to 5%... when all my ingredients are 6% plus???