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Color bar straight into a 1025f box is usually not a problem so long as the piece is small and it goes in on a cold shelf.
Larger pieces of color, lead free color, dark colors, and any combo of these will get micro cracks. What usually solves this is placing a small square of kiln shelf atop the chunk, or even a stainless cocktail shaker over the rod in addition to placing it on a cold shelf. Then just remove the cover 10 mins into heating. Dark lead free colors are usually the worst with cracking (homemade transparents, nero duro) as they absorb the light from the elements as well as maybe being more brittle than the lead stuff.
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