I think you should be ok with your maple syrup.
"Grade B" .... (The United States Department of Agriculture does not have an approved visual glass comparetor which compares to the light transmittance of this grade. Thus, for reference purposes only, a glass comparetor that is equivalent to the light transmittance of 27.0%Tc, and which may be used, is that for "Canadian No. 2 (amber)" as said comparetors were on June 9, 1989);...