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Are you sure that the pin was hot enough? Steel is a great conductor of heat - you are supposed to hold the pin in pliers or stick it in a cork then get the head glowing. If you can withstand the...

They look like celluloid or some sort of synthetic to me:

ivory is usually much thinner/flatter
ivory usually does not have washers under the pins ('collarless' pinnings)
the colour is wrong -...