Bill Barrell Ltd, How to safely remove black sulphur deposits on Great Britain line-engraved stamps.

Описание к видео Bill Barrell Ltd, How to safely remove black sulphur deposits on Great Britain line-engraved stamps.

In this video Bill Barrell asks his good friend, Mike Williams and one of the leading experts on the 1d red issues how to remove the sulphur deposits that can accumulate on the line engraved issues before the Clean Air Act came into force. These ungainly inconsistent black deposits can safely be removed from the line engraved issues, without damaging the stamp.
https://www.barrell.co.uk/

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