how get more black

A good moisturizer is Flexitol heel balm sold at Walmart and Walgreens here in the U.S. I too have trouble with cracks, Works great to keep those painful fissures down.

 

I file down,scrub the crack out with alcohol and seal it up with super glue. Done.

 

Thanks all, for sharing your great tips for keeping the painful cracks at bay. Much appreciated!

Going forward I will be more proactive with the moisturizing. Maybe even try the super glue if I end up with another deep fissure.

 

London Underground. It`s the brake dust, so I'm told. How do other underground networks compare?

 

Shopping centers, underground car parks, subways stations are a great way to get started, also try to step in some sticky stuff, that way your soles can really pick up dirt

and soon your soles too, can look like this (mine)