I don't find these pictures are showing the transparency enough.
Often, the lower the grade, the more transparent the colours. That is, you don't get a solid red or white colour, and you can see more internal organs.
Like the following examples (borrowed from the web) ...
low grade tiger tooth
notice the transparent parts where it should be white?
And notice the red on the head is not solid but transparent?
Notice the spotted red colour?
And the red and white colours bleeding into each other. ie, red showing where the band should be all white, and vice versa.
Legs are all transparent and devoid of colour.
versus
high grade tiger tooth
Where as this high grade specimen shows solid whites.
Solid reds.
No transparency.
White bands don't show any red, and red bands don't show any whites.
Legs showing good colour.