Which of the following colors indicates an SRM value of 30?

The correct color indicating an SRM (Standard Reference Method) value of 30 is deep brown. SRM values are used to quantify the color of beer, with higher values indicating darker beers. An SRM value of 30 typically corresponds to rich, dark beers, such as imperial stouts or heavy porters, which exhibit a deep brown color.

In the context of the other color options, deep amber (which usually corresponds to lower SRM values, typically in the range of 8-14), pale amber (generally falling around 5-10 SRM), and black (which would represent values exceeding 40) do not accurately reflect an SRM of 30. Therefore, deep brown is the most appropriate choice for that specific SRM measurement.