No, there are different colours but they are to clearly show which type of fluid has been used. There are quite a few types of fluid, generally Type I is used for deicing, i.e. Removing deposits from the aircraft and is usually followed by an anti-icing fluid, either Type II or Type IV. To further complicate matters you can also de-ice with the Type II and Type IV. Type II is the red or orange colour and Type IV is the green.

Differing types of fluid provide differing amounts of protection from ice deposits and precipitation.

Generally only the wings and tail are devices, unless the precipitation is very heavy and activel, so the colour of the fluid would not make any difference to an Aer Lingus plane as the wings and stabiliser are not painted.

De/anticing can be done on stand or remotely, more often than not when the spraying is done for frost conditions it is done on stand, as it can be done at leisure in the early morning before passengers are even at the airport. Remote spraying is more normal when the precipitation is active, i.e. Falling and heavy, this means that the deicing is done as close as possible to the aircraft getting airborne. The protection provided by the fluids is only temporary and depends on the temperature and the type of precipitation and how heavy that precipitation is. FReezing rain is particularly difficult to deal with.