The blue and white stripes are intentionally markedly different from the normal curve areas. Normally, the first part of the curve, before anything interesting happens, is green and the last part, after all the exothermic events have taken place, is gray. In between there, we have areas that represent different phases of the cooling that in MetStar are called S1, S2 and S3 respectively. The coloring of the areas below the curve is a way to give quick graphical information about the curve so that it can be compared with other similar curves. After some practice comparing curves graphically, you can extract some general information about the status of the melt, just by glancing the cooling curve. Perhaps most notably, the S2 area is always orange and the S3 area is always red, if they exist. But the color of S1 depends on the solidification morphology. S1 is the area between TL and TELow and if it is yellow, it’s hypoeutectic. If it’s black, it’s hypereutectic. If it’s missing, it’s because TL and TELow are the same and the sample is eutectic. So why the blue and white stripes? They are there to mark that something is missing. Most commonly, we were not able to calculate TEHigh, most likely because there is no such point on the cooling curve to find, perhaps because the solidification was white. The blue and white stripes are there so that you do not extract any other information than that something is missing from the sample.