Natural Dye Workshop with Michel Garcia and Sustainable Dye Practice
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Lime from Builders’ Supply or DIY
Lime is a general term for calcium-containing inorganic materials, in which carbonates, oxides and hydroxides predominate. The rocks and minerals from which these materials are derived, typically limestone or chalk, are composed primarily of calcium carbonate. “Burning” (calcination) converts them into the highly caustic material quicklime (calcium oxide, CaO) and, through subsequent addition of water, into the less caustic (but still strongly alkaline) slaked lime or hydrated lime (calcium hydroxide, Ca(OH)2), the process of which is called slaking of lime.
Lime or Calcium hydroxide, Ca(OH)2 can be purchased from builders’ supply or chemical supply or simply make it yourself by baking/burning shells after you ate the shell fish at around 1000C for 20 minutes and pounding it finely.
–yiw
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1000°C seems awfully hot; much hotter than a typical barbecue or oven. Do you mean 100°C, which is 212°F?
I too am curious about the lime. Living in a rural agricultural area you see a variety of limes at the farm or building store. There is one called “shell” lime which is suppose to be “Lime obtained by burning the shells of oysters, clams, or mussels; once used in making lime mortar, particularly where limestone was not available for this purpose.
Read more: http://www.answers.com/topic/shell-lime#ixzz1lA4Y3yHp”
But I also hear everyone talking about calcium hydroxide or slack lime which is a different compound formula.
Are they interchangeable?
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