Which SR Blue or black Fuse

It is important to note, that when replacing a fuse, you should not handle it with your fingers, as the skin has oils, and if these oils get on the end caps of the fuse, it can hinder the contact being made. The glass body of the fuse should have this avoided as well, as heat from the fuse will dissipate more efficiently ( this is true will all " bulbs, as a matter of fact ). This is another reason why connectors and plugs need to be cleaned now and then, from us handling them. ime…..Enjoy ! MrD.

I thought my natural body oil WAS a contact enhancer, which has kept me from showering during Contact Cleaning Week. 

So my SR Blue just arrived and I popped it into my amp's main IEC connector.  Straight out of the box it sounds a bit dark to me and the lows aren't quite as tight.  I will search the forum to see if others noticed this during the burn in period.  I know this fuse is directional so it's also possible I need to flip it around.  For the life of me I couldn't determine which way current flows through my connector (Note: I know current is supposed to flow from the S to the R printed on the fuse).  Any useful comments are welcome.