"Regiments with black facings had a a black field with a red cross of St. George." pg 177.
"58th Foot – black field with a red cross. pg 180. Note this circa 1812-15.
Ref A Scarlet Coat: Uniforms, Flags and Equipment of the British in the War of 1812, Rene Chartrand, Service Publications, 2011.
In the Osprey Napoleonic Flags 2000, Vol 2, pg. 6. "The Second Colour of those which are faced black, is to be St. George's Cross throughout, Union in the Upper Canton; the Three other Cantons Black." The aforementioned is a direct quote of 1768 Royal Warrant.
However, the note at the bottom of page six states; "In fact this was never put into effect, the Regimental Colour of regiments with black facings being as those with red and white facings." or white instead of black.
The author does not explain why it was it was never put into effect nor does he provides any evidence for this statement.
I know there is documentary evidence that the 89th Foot had black facings and their regimental colour had a black background during the War of 1812, particularly at the Battle Crysler's Farm, Nov 1813.
I would tend to go with Chartrand's more recent book…a black field. That is what I have done with my 89th Foot.
I hope this helps.