CREATE TABLE grapes (id DECIMAL, grape TEXT, color TEXT)
CREATE TABLE wine (no DECIMAL, grape TEXT, winery TEXT, appelation TEXT, state TEXT, name TEXT, year DECIMAL, price DECIMAL, score DECIMAL, cases DECIMAL, drink TEXT)
CREATE TABLE appellations (no DECIMAL, appelation TEXT, county TEXT, state TEXT, area TEXT, isava TEXT)

What is the color of the grape whose wine products has the highest average price?
SELECT T1.color FROM grapes AS T1 JOIN wine AS T2 ON T1.grape = T2.grape GROUP BY T2.grape ORDER BY AVG(price) DESC LIMIT 1
SELECT "T1"."color" FROM "grapes" AS "T1" JOIN "wine" AS "T2" ON "T1"."grape" = "T2"."grape" GROUP BY "T2"."grape" ORDER BY AVG("price") DESC NULLS LAST LIMIT 1