Does Toning Affect Front Of Stamp?

Apologize in advance if this is too beginner of a question.

Does yellow/brown toning of the gum of a stamp affect the front of the stamp as far as readability of the stamp when it goes through the automated machines? I ask because people generally from humid climates sell unused toned stamps (mainly on back of stamp, but sometimes also present in the white selvage area too) as discounted postage and want to be an informed consumer.

Are toned stamps best adhered via a glue stick?

Should not affect it going through the system if it is a mint stamp with gum. Since they are considered damaged and if they are common stamps it is a great way to get use of them. Just moisten it to adhere, no need to use a glue stick, unless it is a stamp with no gum, maybe previously used, but uncancelled. Then that is a different issue as reusing postage is against laws, but a lot of people do it without repercussion, ultimately your choice.

Edit: As rogdcam mentions it should not be done, and I do not advocate for it either. But it is still ultimately the choice of the particular individual, as to what they want to do with their property (stamps). I or anyone else cannot control the actions of others. It is their own decision to make and bear any liability/consequences for their actions.

It is not a choice and it is not a victimless crime. Don't ripoff the postal service.

@Torin: "....too beginner of a question..."

In a past life, I taught beginning & intermediate hiking and mountaineering skills to adults. My advice to my students was simple: "the only dumb question is the one that is not asked."

Certainly one should not reuse stamps that have been used for postage but somehow escaped cancellation.

The original poster may be referring to a situation where the gum of a mint stamp has become disturbed to the point where it is no longer reliable to ensure good adhesion to an envelope. This might be the case if mint stamps got wet and then dried. The back may still become tacky when moistened but may not seem to adhere as tightly as a stamp with undisturbed gum, and a corner or edge way not adhere at all. Another situation would be if mint stamps became stuck together (which could happen in humid climates) and they need to be steamed, soaked, or sweated apart. Again, while some gum may remain and become tacky with moisture these stamps may need an adhesive amendment (such using a glue stick) to be securely affixed to an envelope.

To give a real life example I heard of (without mentioning any names), a little kid once used a large part of a roll of 3 cent Statue of Liberty or 4 cent Lincoln's to decorate a scrap book, art project, or something and those stamps had to be steamed off the paper. When they were used for postage a dab of Elmer's glue was applied for added security. I seem to recall that the little kid was subsequently introduced to the hobby of stamp collecting so he would have his own stamps to play with.

I have always thought that if a stamp is postally unused but the gum has become damaged it is okay to apply an additional adhesive.

monell: I am referring to mint, unused stamps where the original gum has become extremely yellow or brown and sometimes the white selvage area has turned a light beige, but the front of the stamps themselves look fine. The original gum is still present, but has toned due to environmental conditions (most likely humidity).

Climber Steve: That's a good adage.

The link below is an example of what I mean by toning. It looks like in this situation, toning has affected the front of stamp as well. Would these stamps be able to be read by the automated machines? I don't plan on buying them, but am providing the link below for example/education.

https://www.ebay.com/itm/Block-of-4...AOSwO1Neg6se