Why are those keytops BLUE | Piano Technicians near me

Why are the keytops blue?
This piano is being rebuilt, but we want to refresh the action parts and key sticks rather than replacing them to allow us to keep the original ivory keys.

Before Cleaning — Part 1

Before Cleaning — Part 2
Even though it may not dramatically improve the piano’s playing performance, it does impact how the technicians may physically handle the various action parts while rebuilding the action. Cleaning off dust and grime that is 50+ years old helps us work more efficiently and accurately, and contributes to the overall cleanliness of the instrument.

After Cleaning — Part 1

After Cleaning — Part 2
To accomplish this, the keytops are covered with painters tape to protect them while being cleaned with a sandblaster. Once the sand blasting removes most of the bulk of the grime from the keys, sandpaper is used to gently clear any remaining dirt from the wood closest to the keytops.
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