Gretta Darkkettle is the witch on Fire Cat Alley. I think that she should be able to sell a few alchemy spells, like transmutes and jewels and metal transmutes. I think it would be cool if she made you do a quest that would prove she was a good teacher of alchemy. I think it would work like crafting and use the same tables. It would be like 5 mist wood and 10 scrap metal for bronze. Or something like that... This would make crafting jewels a little easier and validate Gretta saying she knows alchemy.