Answer:
I am black when you buy me, red when you use me. When I turn white, you know it's time to throw me away. What am I?
I bring light to a dark world. In a current I travel and through tunnels I am hurled. Touch me and I'll kill you. What am I?
When it comes to me, you go on red and stop on green. What am I?
I am enjoyed by some, despised by others. Some take me for granted, some treasure me like a gift. I last forever, unless you break me first. What am I?
You throw away my outside you cook my inside. Then you eat my outside and you throw away my inside.
When is it bad luck to see a black cat?