Good to know that you are looking at Stock Charts, so we are looking at the same thing.
The black candle means that SnP opened higher today then went into a decline. This is true, but it is also true for a solid red candle. If the decline is enough for the close to be lower than yday, then the candle will be red other wise it is black as it was yday.
Sorry we are focusing on minor details, when the big picture you pointed out is a good one.
Trade the Charts and not the Heart - Expect the trend to
continue until it doesn't - Realtime is the real deal