TomatoGirl wrote: I don't find these acidic at all. In fact I have a friend who had stomach cancer and cannot eat tomatoes because of the acidity. But he can eat these with no problem at all. I have been giving him these tomatoes for 3 years now.
I'd do a trade with you if you like. What do you have?
I have not saved seeds for few years, so how about going back to the origins? These Feuerwerk were originally brought from Russia and introduced to wider population by Reinhard Kraft https://tomaten.bplaced.net/Tomatenfotos/anbau-2004.htm
The freshest seeds I can offer would be Reinhard Kraft's Chocolate Heart, Purple Heart or Green Heart (very few seeds left). Outside of his list, just what's growing this year (will be saving some seeds):
Bulls Heart Pink
Cherokee Chocolate Heart
Grubb's Mystery Green
Spudakee (PL version of Cherokee Purple)
All of my other seeds are 5+ years old, will start re-growing them slowly going forward to re-stock.