Nice!
Steve, those erensjuc flower pictures reveal a lot of lovely detail. The darker veiny highlights especially.
A couple of nitpicking points about the words used to describe them... please forgive me if this comes across the wrong way.
The goal is to clarify not correct.
The word bicolor (bicolour) when applied to aloe flowers typically refers to a color change upon opening (eg. wickensii, cryptopoda, melanacantha, etc.) not to the presence of two colors on any given flower. So the two color effect on bicolored aloe flowers works in series not in parallel for any given flower, if that makes sense.
To be clear, the raceme of a bicolored aloe inflorescence (ie. the collected mass of buds and flowers) may have two distinct colors, but any given flower does not necessarily. The flowers start out one color in bud (predominantly) and then change to another when they open, presumably to draw pollinators in to the flowers that are open for business.
The other interpretation is not necessarily wrong (and in a literal sense it is often quite true), and really who am I to adjudicate such things, but this is the convention I have seen in the aloe books I have read. For example:
Also, fun fact, aloe flowers do not have petals per se (though any casual inspection would indicate that). Apparently the flowers in this group (lilies etc.) consist of tepals (something intermediate between petals and sepals) and that is why the Definitive Guide and other sources refer to the structure as a perianth, to get around confusion in this area. Go ahead and use whatever word you want (of course) and everyone understands you just fine, this info based on anatomical details that frankly escape me but are confirmed in various aloe references I've seen that were written by actual botanists, which I am not.
