I have honda accord hybrid 2005 and i was checked the spark plugs and i found a brown layer on the ceramic?

i have honda accord hybrid 2005 and i was checked the spark plugs and i found a brown layer on the ceramic insulator is that an indication that i need to change the sparks ?I have honda accord hybrid 2005 and i was checked the spark plugs and i found a brown layer on the ceramic?no. the brown layer is caused by the additives in the fuel and is nothing to worry about. the spark plugs on that car are good for 110,000 miles.