Valrhona Products

What are the main differences between the various types of couverture chocolate? How are your chocolates made? I would like some information about cocoa butter. What are pralines and how do they differ from each other? Can Valrhona products be defined as vegetarian/vegan? (Europe) Is chocolate an allergen? What is the double fermentation process? Which kosher certifications does Valrhona use? For which products? Do you have a Health & Safety Certificate number?