I have an old Nikon Alphaphot microscope that came with a 100x oil immersion objective, but no manual. I've seen plenty of sources that explain that you need to place a drop of oil between the slide and objective, but when I went to order immersion oil I discovered that there are several different types. There's Type A, Type B (apparently similar to Type A but more viscous), and a number of specialty types. My plan is to use the microscope for projects like looking at blood cells, pond water, and other high school science project-type investigations?
Which type of immersion oil is right for all around, general purpose use?