During a brief period of the campaign, Deckard Cain can identify items for you as well (effect is exactly the same as if his book was used). There is no need to pay any fee, or buy any reagents for that.

In Diablo III, items can be identified by right clicking them, or by using the Book of Cain, with a 5 second cast time. Gambled items are unidentified (not even their quality is known, all items appear to be magic) until the player purchases them, at which point they are automatically identified when they enter the inventory. Gambling was a new generation of Wirt's hidden deals.

The selling price of identified item is, nearly always, covering the identification expenses. Because of this, the player can choose to not identify an item if they do not plan to use it. While unidentified items are supposed to have unknown effects, due to the fact that unique and set items are colored differently, it is sometimes possible to know what a certain item is without needing to get it identified. However, magic Items can no longer have negative effects except for some unique like Veil of Steel and Andariel's Visage, so there is never a risk involved by identifying them. Unlike the first Diablo, unidentified items cannot be equipped. If they did not complete the quest, Deckard Cain is rescued by the Rogues and will charge the player for identifying their items, just like the first game. If they completed the Search for Cain quest themselves, Deckard Cain would from then on identify all items in your inventory free of charge, including anything they had stashed in the Horadric Cube. In Diablo II, magic, rare, unique, and set items all drop in their unidentified state. The player also had Scrolls of Identify, that could be (for the purpose of saving space in bags) stacked into a single Tome of Identify.

Diablo 2 what is jsp?