All of the patches are not invisible, but you do have to examine the samples.
When you do that, you find cotton threads.
"Upon microscopic examination of the Oxford C-14 sample, Professor Edward Hall,head of the Oxford lab, noticed fibers that looked out of place. A laboratory inDerbyshire determined that the rogue fibers were cotton of “a fine, dark yellow strand.”According to Peter South of the lab, “It may have been used for repairs at some time inthe past…” (Rogue Fibres found in the Shroud, 1988:13)."
From
https://www.shroud.com/pdfs/marben.pdf
"magic god emergy, contamination, invisible patches or fraud."
None of those, but failing the Chi^2 test and visible cotton fibers in the Oxford sample.
Yes, I do have plenty of evidence to reject the carbon dating.