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I ran a grape wash and collected 1.5 liters of product combined 65%. Then I filled grapes into the jug the spirits where in to a total volume of 2.5 liters. I let it sit for 4 weeks and now the product is dark purple. I have filtered it off the grapes and now I am tiring to figure out the proof of the remaining product. The product is so smooth you can gulp it down, like there is very low alcohol content. From a previous post I tried to use a formula Yttrium posted but since I don't intend to add the grape sugar syrup to all the product it will not work for me. I put a little in a spoon and it ignites in a split second when it comes in contact with flame. Anyone have a formula to calculate this? What is the proof if it ignites easily in a spoon?

Old post and it doesn't appear the poster is on the site anymore but I'll take a creative stab at answering this question in the event someone else reads it....
So, ethanol at room temp stops lighting at about 40% give or take. I figure if you took a sample of this stuff, slowly cut it back with water, making note of how much you added until it won't light anymore will give you a rough gauge of the starting proof. By going back and reversing the math on the amount of water you had to add you might get a ball park idea of abv. Crude but possibly useful.