This post is from the Australian Maritime Museum in Sydney and is a fascinating account of the restoration work being carried out on the anchor of the Sirius, on of the ships of the First Fleet.

This anchor is one of the real treasures of Australian history.

Australian National Maritime Museum

If you read my previous blog, you might know that we’re currently treating the Sirius anchor while it’s on display inside the Australian National Maritime Museum.

Sometimes, actions taken to protect objects change their appearance.  When the Sirius anchor was prepared for its original conservation treatment in 1986, a thick layer of marine concretion and organic growth acquired during nearly 200 years underwater was removed with hammer, chisel and a descaling gun.  This exposed the corroded metal of the anchor and allowed it to be treated by electrolysis – this process converts corroded iron to black metal and removes salts.  When treatment was completed the Sirius anchor was painted with an anticorrosive coating.  The thick, black, glossy paint flowed into the crevices and channels throughout the anchor, rounding off the anchor’s surface and filling in some of its texture.

Now that the coating has reached the end of its life and we are removing it, the Sirius anchor is…

View original post 324 more words

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