SgtErv said:
This makes sense, as the color is also uniform throughout. Although a soaking in a dye bath would achieve that, it’s brown inside the cracks, too
If the leather is brown inside the cracks, then the leather was "colored" in the tanning vat. In the period, they only applied dye to the leather that faced the outside and left the inside whatever color the leather came. This allowed them to oil the inside of the leather as needed for conditioning.
OK, British Ordnance supplied a cartridge box (what we would call a belly box), a waist belt w/buckle, a bayonet, bayonet frog and scabbard along with each musket. The leather was "blackened" and most probably with vinegaroon. These items would have come with the muskets when received by the Colonies, even if they were surplus sold to the colonies, though the leather items may have been in well used to downright poor or even unserviceable condition.
Note: British "Regular" Regimental Colonels could store most of those things except the bayonet and scabbard and supply at the Colonel's own expense Cartridge Pouches (what we might call an over the shoulder Cartridge Box) with Buff slings, buff waist belts, shoulder carriages for the bayonet with buff belt - all in an effort to make their Regiment/s more "fancy" or Military looking. When they turned their muskets in for replacements, though, the Colonels had to turn the rest of the "plain/blackened" leather goods in with them or British Ordnance would have charged the Colonels for those items. This made the "plain/blackened" leather items available for issue to Regulars in case of emergency or war and perhaps the English Home Militia's and to go along with muskets they sold or gave to the Colonies.
Though I cannot fully document this, I believe any replacement goods made for Williamsburg before the AWI would have been blackened, to match the minimum requirements of the British Military. Of course once the war began and they issued out the leather goods in store, they probably would have accepted dark brown leather goods as they were cheaper without the dyeing.
Since you know the Original Regiment and when they were issued the items from Williamsburg, may I suggest you email Colonial Williamsburg and ask if the leather they issued then was black or brown? I have emailed a lot of questions to the Trade Shops over the years and always got a response within a few days and sometimes within a few hours. Of course you should give them as much information on the unit and when they were issued the gear.
To Tenngun,
Yes, beeswax was applied to cartridge box flaps to make them semi waterproof and that included the British Issued blackened ones, as well as brown ones. That is mentioned in "A Soldier Like Way" and a couple other sources including (I think) Cuthbertson.
Gus