Conservation-restoration of the Statue of Liberty The restored statue was reopened during Liberty Weekend, its 100-year anniversary celebration held July 3–6, 1986. The preparations for the centennial celebration of the Statue of Liberty began in 1979. Formed by the National Park Service (NPS), the custodians of the statue since 1933, to investigate possible development alternatives[incomplete sentence]. A report titled "Analysis of Alternatives", published in December 1980, proposed measures to remedy the certain conditions confronting visitors to the Statue of Liberty, such as the long lines and waiting time to enter the crown of the statue. The proposed measures included the instatement of systems for numbered ticketing
Statue of Liberty of the copper skin over decades, leaving two layers of coal tar, originally applied to plug leaks and prevent corrosion. Blasting with baking soda powder removed the tar without further damaging the copper. The restorers' work was hampered by the asbestos-based substance that Bartholdi had used—ineffectively, as inspections showed—to prevent galvanic corrosion. Workers within the statue had to wear protective gear, dubbed "moon suits", with self-contained breathing circuits. Larger holes in the copper skin were repaired, and new copper was added where necessary. The replacement skin was taken from a copper rooftop at Bell Labs, which had a patina that