Trouble Using Ferry Morse Soil Test Kit?

I purchased a premium soil test kit by Ferry Morse. I followed the directions to the letter. I was testing for PH, I came up with a color that is not on the color chart. It came up an olive drab, army green. Any input would be appreciated.

The kit also comes with a filtering device for other tests. I didn't have any luck with it either. Couldn't come up with a color that came close to the chart.

Hardiness Zone: 5a

By Dan