Custom spells

Some questions for silveroak, regarding lab magic planning and Oliverius.

  1. If I have an item create a concentration effect (we'll say light) that the item maintains, and it can be used four times per day, the item can maintain four balls of light per day, correct? I didn't find anything saying an item is limited to a single effect of concentration.
  2. Coal is a stone, correct? (CrTe3 to create a cubic foot, which is around 80 pounds of coal). How much coal would Oliverius use a day during lab work for doing his forging with blacksmithing or goldsmithing? Would it be an upkeep bonus, or an items/quality bonus for having exceptionally pure (hermetic) coal? Also, how much coal does the covenant's 5 blacksmiths use each day?
  3. I realized while doing research for these ideas, that Oliverius with his MMF is well-suited to playing around with my Forge of Hatred idea (https://forum.atlas-games.com/t/forging-your-hatred/11410/1) which you've commented on before. Before I even begin to look at that, I should ask if actually making a sword out of solid hatred would actually have any effect other than being a magical example of a sword.