Then by slow degrees a proportion of " dryers " is added - usually equal weights of litharge and minium being used to the extent of 3% of the charge of oil; and with these a small proportion of umber is generally thrown in. [Please select]
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] In most producing areas sun-drying is preferred, but in countries where much rain falls, artificial dryers are slowly but surely coming into vogue. [Please select]
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Dryers should be changed at least every day. [Please select]
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