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Interesting,have actually tried to melt horn to use as a filler on worm holes without success.
Being Keritan, it burns instead of melts.

Agreed>>>>>>>>>>

Define Sealant,you cannot seal some natural materials,perhaps protectorant is a better word.

They never sealed Ivory,they Oiled it with mineral oil,This allows transpiration as do's ren-wax.
I can ship Ivory from my local with a humidty of 25% to Florida with a Humidity of 90% and it will...

Like Ivory and Bone,horn is hygroscopic,It expands with Humidty Changes.
Do not Know about horn but I can Gaurantee that if you seal Ivory on both sides it will Crack.

Gravity???????