Calcium hydroxide (lime) is reactive towards atmospheric or dissolved carbon dioxide. Any deposits of calcium carbonate can damage the sensitive grain layer. TFL describes procedures to prevent this occurrence, which includes application of complexing agents.
Lime blast occurs as a result of the limed pelt being exposed to the air. The lime in the pelt reacts with CO2 in the air to produce insoluble calcium carbonate. This can happen, for instance, if uncovered limed stock is left too long in lime yards with open doors either end allowing the air to blow through. Fumes from diesel fork lift trucks can also add to the likelihood of lime blast.
Good Practice: Keep limed goods covered and out of windy areas. Use a complexing agent, BORRON LB in the final wash out of lime. BORRON complexing agents are also active against iron as well as calcium ions.