bone char which is the bones of cows is used to whiten sugar.

No, Domino Sugar uses bone char filters.

'char a' and 'char a' are identical.

Someone previously responded "Sugar is obviously vegan."

This is not necessarily the case. Bone char is used in the sugar refining industry.

Unfortunately I cannot answer the original question but was concerned that the blanket statement that "(s)ugar is obviously vegan" is at the very least misleading to those who do not use bone char processed sugar.

Yes it is! Redpath Sugar uses activated charcoal to filter their sugar, unlike others who use bone char.