Lino
The Eco-goldex product does NOT work like normal cyanide (sodium or potassium cyanide)
Eco-goldex product is made with a "complex" of "several" different chemicals - "one" of which is ether potassium ferri or ferro cyanide (can't remember off the top of my head)
ferri/ferro cyanide will not dissolve gold - unless you dis-associate the iron from the cyanide
That is normally done with exposure of UV to the solution which then allows the cyanide to dissolve the gold
However - Eco-goldex came up with this chemical complex (it's their secret blend) which dis-associates the the iron from the ferri/ferro cyanide to allow the cyanide to dissolve the gold
The problem is - that what ever the other chems are - used in their product to dis-associate the iron --- ALSO prevents recovering the gold from the solution with zinc, aluminum, carbon, or electro winning
In order to recover the gold from solution - the solution first needs to go through more chemical additions &/or steps
one of which is the addition of ammonia - or a chemical additional process of their own (& of course they are more then glad to sell you those chems) --- other wise the gold WILL NOT drop
When I tried the Eco-goldex product I used the addition of ammonia in order to recover my gold
That said - although house hold ammonia will work - it take a LOT because it is so diluted (& I do mean a LOT) - so - I ended up having to go get an industrial grade (high %) ammonia in order for it to effectively recover the gold
Bottom line - though the Eco-goldex product works "well" at putting gold into solution (as a gold cyanide) recovering the gold is nothing short of a REAL pain in the you know what
Which is why - other then the one time experiment where I tried it to investigate the product I would/will never use the product again & most certainly do not recommend it
They sell you the Eco-goldex product - then you have to go back to them in order to get you gold back out of solution
Kurt