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Hydrated lime is not a necessary mortar ingredient. You can make mortar with just Portland cement, sand and water. The mortar that I used to permanently attach the brick and stone to my patios did not contain any hydrated lime. But adding hydrated lime to the mortar mix can be beneficial. The plasticity or workability of the mix will improve. When hydrated lime is added to the mix, the sand and the cement do not separate.
If you do make mistakes, try to scrape off as much excess mortar as you can that day. Then wait 30 days before you attempt to clean the mortar paste from the brick. Use a solution of muriatic acid and water mixing one part acid to ten parts water. Dampen the brick to be cleaned with water and add the acid solution.