[Jewelry making - Article 00046] - [Orchid] Recipe for lime sulfur

[jesse brennan]

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    A combination of hydrate lime (CaO) mixed with sulfur.  Lime sulfur
    is extremely water soluble, but incompatible with other pesticides
    due to it's alkaline reaction when diluted with water.  It should be
    used by itself. 

    Lime sulfur can be made by combining 20 pounds of rock lime and 15
    pounds of flowers of sulfur with 50 gallons of water.  Place in a
    large iron kettle or boiler outside (this stuff smells!) and boil
    for one hour.  Allow to cool and settle.  The clear, amber fluid
    remaining after filtering is lime sulfur.  It's probably cheaper and
    easier to purchase a prepared product. This stuff is a  pretty  plant
    fungicide . 

    My comments; The "recipe" may be a little confusing .. I take rock
    lime   to be calcium carbonate  (CaCO3 ) Kilned lime or burnt lime
    will be calcium oxide  ( CaO )   which becomes slaked lime - calcium
    hydroxide - hydrated lime (CaOH)  when mixed with water.   I don't
    see any "magic" in the chemistry although I would be most likely use
    a burnt or kilned lime which is more alkaline.  All components
    available either at a garden supply or  in the concrete materials
    area for the  hydrated lime.  A 50 # sack is about $4.50.  Excesses
    can go thinly on the lawn or garden especially east of the
    Missisippi river in the US. DO NOT ACIDIFY as this makes  hydrogen
    sulfide (H2S)  Rotten egg smell. This is a toxic gas. 

    Like everything be careful.   And the Recipe is scalable - a batch
    doesn't have to be that big! 

Jesse


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