We should confirm which grade of Calcium Hydroxide it might be since "high calcium hydrated Lime" is really good stuff. Plus it's good thing to have magnesium oxide in the mix. What ever we got - it is more potent than Ms. Wages Pickling Lime - judging my my coughing this morning! Here are the three common of calcium hydroxide grades:
High calcium hydrated lime - high calcium quicklime produces a hydrated lime containing generally 72 to 74 percent calcium oxide and 23 to 24 percent water. (only slightly less potent than commerical CaO)
Dolomitic hydrated lime (normal) - under atmospheric hydrating conditions only the calcium oxide fraction of dolomitic quicklime hydrates, producing a hydrated lime of the following chemical composition: 46 to 48 percent calcium oxide, 33 to 34 percent magnesium oxide, and 15 to 17 percent water.
Dolomitic hydrated lime (pressure treated) - this lime is produced from dolomitic quicklime under pressure, which results in hydrating almost all of the magnesium oxide as well as all of the calcium oxide, producing the following chemical composition: 40 to 42 percent calcium oxide, 29 to 30 percent magnesium oxide, and 25 to 27 percent water.