Nostalrius Begins - Quality wow vanilla realm (1.12)

So i was wondering if the + 1-7 shadow dmg on Blackvenom Bladehttp://db.vanillagaming.org/?item=4446#dropped-by get increased if you have alot of spell dmg/shadow spell dmg.

Also if nature spell dmg increase the +16 - 30 Nature Damage on Thunderfury, Blessed Blade of the Windseeker http://db.vanillagaming.org/?item=19019

can anyone confirm /deny?

I have a similar weapon, Shadowfang http://db.vanillagaming.org/?item=1482, which has a + 4-8 shadow damage. I've never seen this damage show up on my combat log. Even after duels and carefully parsing the logs, I've not seen this damage. Maybe it's lumped together with the white damage, or maybe it just isn't logged. Or maybe it is a bug, who knows?

it is factored into the white damage and no it does not increase with spell damage