The diplomatic neutral colour

What is a neutral colour?
Is it a pH=7 colour? A transparent colour? Greenish… brown? An oil colour… or maybe acrylic?
Conservators mean by it: “I will paint the missing area with a single colour which you won’t see much”. It can be green, purple, pencil coloured or either with acrylic paints… Controversial is on the cards and whatever we do, even when not doing anything at all, conservators know that our decision will not suit everyone’s taste. Continue reading

Damned “sellotapes”!

Which damages cause sellotapes? Can we release documentary heritage from these fatty strips?
Explanation for the degradation mechanisms of this historic “remedial” tapes that we can find in documents of all kinds, and restoration possibilities in each case. Continue reading

Restoration of school poster from spanish civil war period

This map represents the typical scholar posters: with its wooden slats to roll and hang, lined on the back. It was very common to varnish them with shellac to waterproof and protect them from abrasion. This one was made of two pieces of printed paper, sticked together along the central horizontal stripe. It is from 1936, spanish civil war was barely breaking.
Removing the old varnish has allowed to repare other minor damages: tears, gaps and wrinkles. But most important is that the new varnish is not oxidizing nor yellowing. As it is very flexible it will not crack in the future. Continue reading