In its native Mexico, Dahlia coccinea can occur as pure yellow flowers through orange and red to blackish scarlet blooms. Orange-red is probably the most common color. Occasionally, when different color plants cross, the offspring are parti-colored, or with rays that are bi-colored (e.g., orange and yellow). Dahlia coccinea will also form interspecific (= between species) hybrids with just about any other species with the same number of chromosomes. These include the species with lavender or purple flowers. The result is often a muddy tangerine color if the other parent was light lavender crossed with an orange-red. The darker the purple parent, the more likely the red will not mask it. The reason I mention this is because their US description says "Dahlia coccinea species mixed," which does not make a lot of sense. D. coccinea is itself a distinct species. Maybe they had separate species at one time but all got crossed in their fields. Anyway, as you say, it is always fun to see what turns out.