What is the temperature classification of a purple colored glass bulb?
CREATE TABLE "operation" (
  "maximum_ceiling_temperature" text,
  "temperature_rating" text,
  "temperature_classification" text,
  "color_code_with_fusible_link" text,
  "glass_bulb_color" text
);
SELECT "temperature_classification" FROM "operation" WHERE "glass_bulb_color"='purple';