I used to use Niagra only. Then I discovered liquid starch at Wal Mart. I now use it - it is SO much cheaper. I have not even used a whole bottle yet. I put some in a spray bottle (maybe 4 oz) and fill the rest with water, use half of it and then refill with water. It lasts a long time and does a good job. I iron my fabric and my clothes with it. Never had it go bad. Obviously, the more starch in the bottle the stiffer the fabric.