I wonder if they printed the directions wrong....

Seriously.

In the standard FAS-DPD test that Taylor has made for years, you add the FAS-DPD powder, add the reagent in the brown bottle till it's clear getting the FC value, then add the 5 drops from the 0003 bottle, use the brown bottle till it's clear to get the CC value. Add FC + CC to get TC.

If the directions say something different, they may well be wrong.

TC = FC + CC That's always and forever.