Tonal differences in techeles

Was about to start a rebind of a tallis katan and realised they where together with one of my tallis gadol a good example of the tonal differences one can expect from ptil techeils. The katan is the darker one in the middle. I’ve seen even lighter techeiles threads.

Both are ptil techeiles only differences is age (the gadol shows more yellowing on the white threads), but the techeiles have remained basically the same and is about 9 years of weekday use (shacharis and minche).

Also got some with Techeiles chabura and it’s similar there but have yet to see any lighter then the gadol here.