How to recoginze the butyl rubber inner tube?

The methods to recognize the butyl rubber inner tube : 

The inner tube body has color line with width no less than 2mm .

1. Butyl rubber inner tube, there should be blue line on its circumference.

2. Butyl rubber and halogenated butyl rubber inner tube , there should be green line on 

its circumference.

3. Butyl rubber and EPDM rubber inner tube, there should be red line on its circumference.