10. Vulcanian (#f9844e): 160-450 Kelvin. Hot worlds with clouds of sulfur dioxide and sulfuric acid, often accompanied by volcanic activity. Bright orange or red in color. 11. Pyrocryian (#f15a24): 190-550 Kelvin. Extremely hot worlds with clouds of molten metals and silicate rocks. Glowing red or orange in color. 12. Hadean (#130f0e): 450-2000 Kelvin. Super hot worlds with thick clouds of vaporized minerals and metals. Deep black or dark gray in color due to high temperatures and lack of reflective clouds.

Hydronian gas giant class with hex colors: 13. Hydronian (#ffffff, #ffffaa, #d2b48c): 170-350 Kelvin. Clouds of water, with some organic hazes. Predominantly white clouds, with hints of yellow or brown from hazes.

Thank you for providing additional gas giant classes. Here is the updated list with the new class included: Gas giant classes: 1. Cryoazurian (#a7cbd9): 0-90 Kelvin. No tropospheric clouds and only faint hazes. Dull blue in color, occasionally with hints of cyan from hydrocarbon hazes in the upper atmosphere. 2. Frigidian (#dae2f2): 5-20 Kelvin. Extremely cold hydrogen clouds only capable of forming on worlds that are far from any stars. White clouds with hints of grey and blue. 3. Neonean (#f2dfe8): 15-35 Kelvin. Very cold neon clouds. 4. Borean (#f2daf1, #e5daf2, #f8cbbd): 35-60 Kelvin. Clouds of nitrogen, carbon monoxide, or more rarely oxygen. Various colors, typically pale pink or purple, although reds, oranges, or browns may occur from discoloration from organic hazes. 5. Methanean (#cfe9f4): 60-90 Kelvin. Clouds of methane, ethane, and occasionally argon. Usually accompanied by moderate amounts of organic haze. Light blue to turquoise in color, but can become more of a dull green or even bronze from extensive haze. 6. Mesoazurian (#81d4c4): 90-550 Kelvin. Uncommon clarified atmospheres. Usually teal or green in color as a result of heavy discoloring by organic and sulfur hazes. 7. Tholian (#f9be5d, #f3e186, #f09a4a, #874226): 60-550 Kelvin. Various organic hazes that obstruct the surface and any clouds below. Various colors, but usually pale yellow, orange or brown. 8. Sulfanian (#f5f5aa): 80-180 Kelvin. Sulfur enriched ammonian worlds. Clouds of hydrogen sulfide and ammonium hydrosulfide, with lesser amounts of ammonia, hydrogen chloride, sulfur dioxide, and organic hazes. Dull yellow, orange, or gold in color. 9. Ammonian (#f0e4d4, #c48751): 80-190 Kelvin. Clouds of ammonia, ammonium hydrosulfide, and occasionally carbon dioxide, with significant organic haze. Various colors, typically cream, peach, or orange. 10. Hydronian (#d9d9d9): 170-350 Kelvin. Water clouds, usually with some amount of organic hazes. Clouds are predominantly white, but can take on a yellow or brown tinge from hazes. 11. Acidian (#f0eac8): 250-500 Kelvin. Clouds predominantly of sulfuric acid, with significant amounts of sulfur aerosols. Phosphoric acid and ammonium chloride clouds can occur but more rarely. Tan, taupe, or beige in color.