As far as how a coroner describes things in spoken notes at autopsy- things must first be described as they are SEEN, before they are tested.
For example- her bracelet, ring, necklace and cross are described as "yellow colored metal" because that is how they appear as first seen on the body. After they are removed, it can be acertained what KIND of yellow colored metal, i.e. 14K, 18K, etc.
Blood has a color, odor, and viscosity well-known to a coroner. When it as described as "blood" it is because the coroner is certain that is, indeed, blood. But "thin watery red fluid" or "red staining" may be blood that is mixed with other fluids. So while the coroner may think it is blood, he must first test it to see what else is there. But he will describe it the way he first observes it on the body. For crime-solving purposes, to decribe the red staining as simply "blood stains" would not be prudent. If the samples later are found to also contain semen, or another fluid, the first description would be inaccurate.
The same is true for the tan mucous in her nostrils. Presumably the coroner has seen bloody mucous before. This was likely nasal mucous mixed with blood from the head bash. But until that mucous is tested, it must be noted as it appears: tan mucous.