It is unusual to say that somebody burned something 'to black'. We can say that somebody burnt (British) or burned (US) something black if we mean that they burnt it, or caused it to be burnt, so long that it became black in colour.
Her older sister Miriam, who also has come to Langley Park, can still
vividly describe how the guerrillas seized a bus she was riding to
market and burned it black while all the passengers lay in a ditch.
Washington Post Magazine (1997)
We could make a book,” said Violet. “We have all the papers left from
“So we could,” replied Jessie. “But what could we use to make the
“We could use a burned stick out of the fire,” said Violet.
So Jessie put the end of a long stick into the fire and burned it
black. Then she used the burned end to make words.
The Boxcar Children Mysteries
Refurbished this chainsaw bear recently. After wire-brushing off the
old finish I burned it black and gave it several coats of TotalBoat
Doug Pisik, wood artist