According to this eBay listing http://www.ebay.co.uk/itm/Sennheiser-HD800-6ft-Pure-OCC-Silver-cable-1-4-Viablue-and-others-available-/120980918646?pt=UK_AudioVisualElectronics_HomeAudioHiFi_Headphones&hash=item1c2b065176
Silver Poison is also pure silver with gold in it. What is the difference between Silver Poison and Silver Widow? I only know the cost is different.
Silver Widow is more detailed than Silver poison and has a better bass punch.