Antifreeze:
some are greenish.
For example the BMW approved Glysantin which is new has a purple colour.
The Glysantin Protect Plus/G48 is blue-green.
Just do not use Glysantion Protect Plus/G05 which is yellow colored, as this is for heavy duty cast iron engines. Unfortunately I can only find at the moment the German page.
http://www.basf.de/basf/html/d/produ...odukte/g48.htm
If your car is 1993 and has LAD, there is Pentosin CHF11s inside. Pentosin CHF 7.1 was used in early models.(at least that was for E32 models)
Buy some Pentosin and compare it with the fluid inside. Use a white paper kitchen towel and dip it into the reservoir.
What is mentioned on the cap of the reservoir?