I would not use it, it is probably rancid.
Brand name for solid vegetable shortening.
shortening adds lipids or fats to tenderize the flour.
Shortening is called so because it shortens the gluten strands in flour. Shortening is any kind of solid fat, i.e. vegetable shortening (like Crisco), lard, butter, or margarine.
You can safely substitute liquid oil for solid shortening in baking ONLY if the recipe calls for the shortening to be melted first. You can substitute butter or margarine for shortening ( 1 cup + 2 Tbsp for each cup of shortening). You can also substitute 1/2 cup applesauce or prune puree for each cup of shortening.
Usually it doesn't really matter what type of solid shortening you use. Flavor may be a consideration, but it should perform alright. In some recipes it needs to be one or the other.
A solid fat made from vegetable oils, such as soybean and cottonseed oil. Although made from oil, shortening has been chemically transformed into a solid state through hydrogenation.
Probably at any supermarket - shortening is simply a food grade fat. Crisco is the most common brand - in some countries you may find Kremelta. It's called shortening because it is used to make 'short' pastry - that is, a pastry with a high proportion of fat and very little liquid. If a recipe calls for shortening you can substitute with the same weight of butter, margarine, lard or coconut fat. You can also substitute with the same weight of cooking oil but in that case you would need to reduce the volume of other liquid ingredients accordingly.
Yes, solid Crisco can be used. Not Crisco oil.
All you need to do for any solid is place it in enough water to displace the amount needed. For example, place the solid crisco in one cup of water in a two cup measuring cup, add the solid crisco until it hits the two cup line and you have a cup of solid crisco.
You could probably substitute a solid white shortening such as Crisco for lard, although I would be concerned about unhealthy aspects of partially hydrogenated oil.
Any solid shortening will work. The finished product will vary a little bit in flavor, but should be acceptable. For tea biscuits, I would use butter or margarine for flavor. Crisco or other vegetable shortening will work but I would stay away from animal fats.
You can use butter instead, although you really won't get the same texture as you'd get using Crisco. Oil does not work in Irish Soda Bread. You could try searching for an Irish Soda Bread recipe that doesn't include Crisco.