I have a bunch of the little silica gel packets saved and dry and use some from time to time. Just got a similar dessicant packet from the nori we made sushi with, and it's labelled "Lime Dessicant/Do Not Eat/Do Not Open/Your Children Will Die/blah/blah".
So wp says this stuff is (by now) calcium hydroxide. Any use in the home shop? We eat a lot of sushi.