Yehoshua, would you agree to ask R' Shammai Gross Shlit"a the following questions?
1. The blackening ingredient in Dio Lanetzach is pure עשן. It also has עשן שמן זית. I have received a request to make a version of Dio Lanetzach in which the majority of the עשן is עשן שמן זית. Is there any Hallachic benefit to having a majority of עשן שמן זית ? If yes, why?
2. Most of the עשן I use now has a much stronger blackening power than עשן שמן זית. That's why Dio Lanetzach has such a strong black color. It can be diluted with a lot of water and retain its strong black color. עשן שמן זית does not have such a strong blackening power. The technical reason is that the current עשן is more than 95% black carbon and less than 5% foreign unwanted materials. עשן שמן זית on the other hand has about 60% black carbon and 40% foreign unwanted materials. In such a case is עשן שמן זית still preferred? Or, is the strongest black color preferred? (adding a larger quantity of עשן שמן זית does not help because of the foreign unwanted materials in it which can do more damage than good.)