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1
Place in a furnace heated to, but not above, redness, and cover the crucible.
A Text-book of Assaying: For the Use of Those Connected with Min...
2
Cover the crucible, leave it for a minute or two, and then pour.
A Text-book of Assaying: For the Use of Those Connected with Min...
3
Cover the crucible and heat until a quiet, liquid fusion ensues.
An Introductory Course of Quantitative Chemical Analysis / With ...