This page brings an image of Codex Sinaiticus together with images of six other manuscripts of antiquity for visual comparison of the parchment, and the quality of the text.  While comparing the aging of the parchments, note the abundance of corrections in Sinaiticus beside the relative absence of corrections in the other manuscripts.

Click on any of the other manuscript images to enlarge the image for that image to be enlarged beside the sample page from Codex Sinaiticus (Q36 f4r - CFA)