I found these on the internet…
Substitute For Corn Syrup:
Use one quarter (1/4) teaspoon of cream of tartar for each two cups of sugar. The cream of tartar will change some of the sugar into glucose, which prevents crystallization of the sugar as it cools. This is why corn syrup and the like is used. Cream of tartar obtains the same results without the addition of more sugars. The chemical name for cream of tartar is potassium hydrogen tartrate.
or
LIGHT CORN SYRUP SUBSTITUTE
2 c. white sugar
3/4 c. water
1/4 tsp. cream of tartar
Dash of salt
Combine all ingredients in a heavy, large pan. Stir and bring to a boil. Reduce heat to a simmer and put cover on it for 3 minutes to get sugar crystals off the sides of the pan. Uncover and cook until it reaches soft ball stage. Stir often.
Cool syrup and store in a covered container at room temperature. It will keep for about 2 months. Makes almost 2 cups.