Refractometer Reading for French Fry-able Potatoes

Hey guys! I've been researching sugar/starch content for potatoes that are suitable for frying because as effective as the chefsteps brine test is, it's a little more cumbersome than squeezing some juice onto a refractometer.

Any recommendations on a brix percentage for potatoes that will make great french fries?

Thanks!

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Brandon_Byrd_40557

The brine test is designed to measure water content rather than the amount of sugar or starch in the potato. I'm not sure if measuring the sugar/starch content will tell you anything especially useful.

Brandon_Byrd_40557

If you head over to Vimeo, you can check out the Fish and Chips episode of Heston Blumenthal's In Search of Perfection. Around 11 minutes in, you can watch Heston and Chris Young trying a bunch of different strategies for measuring the dry matter content of potatoes. None looks particularly great, and at the end Heston just gives up and tells you to simply buy Arran Victory or Maris Piper potatoes and cross your fingers that the water content is right.