Yes, except XLR A- and B-series, which offer UL94V-0 material (incl. halogen).
Yes, except XLR A- and B-series, which offer UL94V-0 material (incl. halogen).
Silver has the characteristic to tarnish. This gray looking film is just an optical effect and does not affect the contact resistance or the ability of the contact to take the solder.
The contact resistance of chromium plated (black chrome) shells is slightly higher than the resistance of nickel-plated shells. That’s usually no problem for all audio transmissions. Regarding EMI at HF transmissions we recommend to use nickel plated cable connectors in combination with chassis connectors with EMI optimized ground contacts.