Dark Souls | Using a Soul of Gwyndolin to ascend a Sorcerer's Catalyst to a Tin Darkmoon Catalyst

This is done with the Anor Londo blacksmith.

Tin Darkmoon Catalyst
http://darksouls.wiki.fextralife.com/Tin+Darkmoon+Catalyst

You need 5,000 souls and one of the following:

Sorcerer's Catalyst
https://darksouls.wiki.fextralife.com/Sorcerer's+Catalyst
-or-
Oolacile Ivory Catalyst
https://darksouls.wiki.fextralife.com/Oolacile+Ivory+Catalyst

(I'm playing Dark Souls: Remastered.)