How to Preserve Watercolours
Artists & Illustrators magazine online provides some helpful advice on how to preserve watercolours. Here is an excerpt from their full article found here:
3 Golden Rules for Preserving Watercolours
1. Keep a gap between the glass and artwork
A window mount that conceals the very edges of your work will do this, by the minimum 2mm. If you are planning to just attach your painting to the frame’s backing board, you will need small wooden fillets to create this minimum breathing space.
2. Avoid masking tape or sellotape
It will rapidly stain the paper and cause irreparable damage. Any good art shop will stock PH-neutral, water based adhesive and archival tape.
3. Choose where you hang your work carefully
Avoid areas of humidity (such as bathrooms and kitchens) and places that will experience extremes of hot and cold, such as just above radiators, or on the inside of exterior walls. Watercolours will fade if hung in direct sunlight too. Modern pigments are far less fugitive nowadays, but careful hanging is still vital to their longevity.