Blackadder
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My understanding is that makers like RM nowadays uses brown aniline dyed HH with a black pigment top coat to artificially enhanced the "teacore" effect while the old vintage stuffs we often see are pigment finished raw tanned hide.They write:
"カラ―「BLACK」は茶芯、「D.BLACK」は黒芯となります。"
So 'Black' is chashin/tea (brown) core and 'D. Black' is kokushin/black core, similar to the two black colours used by Freewheelers and alluded to by Carlos in his post above, which they call 'Black Jack' and 'Rude Black' resp..
In the pic posted by Carlos it says, that FWs normally use 'Rude Black' which has a grey black core for the LaBrea, but at that time they used the 'Black Jack' with the red brown (russet?) core, that they had used for the Speedmaster and the Dustbowl jackets before.
I just checked my JoeMcCoy car coat on RMC's site.
https://www.realmccoys.co.jp/catalog/products/detail.php?product_id=4495&pg=
There it states: "タンニン鞣しピグメント仕上げ" which translates as "Tannin tanned pigment finish".
When I bought the coat, I asked the guy from RMCs, if the black would over time reveal brown and he affirmed that.
Tannin tanned is probaly vegtan.
So the recreation of the vintage tea core seems to be mostly vegtan leather with pigment dye, brown leather underneath and then black on top, but not an impenetrable layer, but rather one which will wear off with time.
The D Black is only available in J-100 but most if not all regular issue RM jackets are brown core. FW on the other hand likes to switch the colour every year in cycle so Rude Black one year then to Vintage Black then perhaps to Black Jack hence a brown core black FW is rarer. FW does that all the time. For example, the aviator vest changes from sepia brown in year 1 to khaki in year 2 then back to sepia brown the next year.