Keyletter and label fade
Keyletter and label fade
I found there can be some fading of keys on letters and labels with this process. It's minor and it only tends to happen when you overcook things.
For example on the images below. The top one show the case pre-treatment and bottom one after. The lighting conditions are different in each image but you can see the Option key has faded substantially.
Similarly, you can see in the photo below that the "N" key has faded also.
Recall that these keys got a full FIVE days (24 hours a day) in two lots of peroxide solution. I was determined to remove all traces of yellowing. I did, but it was perhaps a little extreme.
Another example can be seen in the IIe case. You can see the label before and after. The label on the treated case is still quite readable but it has faded it a little.
I saw the process first hand when I inspected the case during the process and noticed one of the flakes of dried paste actually had an imprint of this lable in the flake itself. So something may well have been coming off.
So, what I'm finding is the process works very well, but you need to take some care with keys and labels. It seems to be a case of making sure you don't keep the process going more than you need to and finding a balance between removing the yellowing to an acceptable level, and not overdoing the treatment. With my Atari, in retrospect I would have been better to remove the keys that had already completely de-yellow at the end of 3 days (the select key was one of them), and only treated those that needed further treatment, rather than just keeping them all togther.
This whole thing is a learning process though.
Tez