Or methanol (under the right circumstances): "Pure alcohols burn with a nearly invisible flame in daylight." (http://www.energyquest.ca.gov/transportation/alcoh

Or methanol (under the right circumstances): "Pure alcohols burn with a nearly invisible flame in daylight." (http://www.energyquest.ca.gov/transportation/alcohols.html http://www.energyquest.ca.gov/transportation/alcohols.html) Which was done in (yeah, I know) an episode of CSI:Miami: http://csimiami.wetpaint.com/page/207:Grand+Prix http://csimiami.wetpaint.com/page/207:Grand+Prix Though, of course, hydrogen is far more exciting.