It was called Argo Starch. They still make it. My mother made it in two strengths. One for dresses & shirts and one undiluted for Daddy's collars & cuffs. I have some now but you can buy Sta-Flo starch by the quart for very little and that's what I use. It can be used full strength or diluted. I never starch my material until I'm putting it in a quilt top and then it's washed out.