Deer readily eat them, and, after a preliminary steeping in lime-water, pigs also.
calcium hydroxide solution is used as " lime water " .
On warming citric acid with an excess of lime-water a precipitate of calcium citrate is obtained which is redissolved as the liquid cools.
The crude product is very impure and possesses an offensive smell; it may be purified by forcing a fine spray of lime water through the liquid until the escaping water is quite clear, the washed bisulphide being then mixed with a little colourless oil and distilled at a low temperature.
Carbon dioxide, recognized by turning lime-water milky, indicates decomposable carbonates or oxalates.