The introduction of the SR Pink fuse was announced on April 1st, so I wasn't convinced at first .........
I have one Master fuse (first UK 13A mains plug, from wall to Aletheia PSU2 balanced mains distribution) one Purple in the mains PC (which I was given, free of charge), feeding power to my dCS Vivaldi Apex DAC and the rest are mainly Oranges (13A and internal casework fuses) with a smattering of Reds.
I tried a Blue (didn't like it - although it does enhance the picture quality in the mains plug to my LG OLED TV, where it now resides!), but don't have any experience of the Black, which a friend, who's judgement I trust, cautioned me to avoid!
I like the present balance of my system, so I don't think I will be auditioning the "Pink!"