Tuesday, January 26, 2010

Mounting Parchment & Vellum

Materials
Vellum: size of board + 40mm all around
Board: 12mm Plywood
Glue: Starch Paste
Lining Paper: Standard (acid-free)


1. Line the upper surface of your board with lining paper - usually white or light cream, as it will affect the color of the vellum. Use Acid-Free paper for longevity.

2. Dampen Vellum on both sides with a wet sponge.


3. Leave until water has sunk into vellum.


4. Please the Vellum face down on the table.

5. Place the Board face down on top of the Vellum.


6. Cut the corners of the Vellum so that, when wrapped, they will fit properly around the Plywood, overlapping on the reverse, but not on the edges.


7. Paste outer 30mm of the Vellum, and the outer 30mm of the board. There will be a thin strip of unpasted Vellum near the front edges. This is to ensure that the glue does not creep under the front surface of the vellum.


8. Pull the vellum around the edge of the board, and press down on the reverse board one side at a time.
Then, one end at a time, push out air as you progress, re-wet edges of vellum if it seems reluctant to stretch tightly around the edges of the board.


If the Vellum does not stay down, use pins, staples, or tape to hold it.

9. Cover reverse of the board with more glued lining paper, removing pins or tape as you go.


10. Wipe the vellum face with a wet cloth to remove grit and marks.


11. Leave to dry. As skin dries it will become taught around the board.



To download the full pdf version of this instructional, click here!

Thursday, January 7, 2010

Buffered vs. Unbuffered Tissue

This question is commonly asked, and we feel it is important to outline the differences,
and thus the preferred uses of each.


Buffered Tissue has an alkaline, or basic, composition (ie pH above neutral; pH 7), which usually is achieved by adding calcium carbonate to these tissues.

Instances when this buffered surface would be preferable are when storing natural fiber based materials (like cotton fabrics, or cotton papers), as well as many synthetic materials. The alkaline properties of the tissue work to neutralize any acidity that come in contact with the material, and thus increase its longevity.

But, beware when using buffered tissue that the paper has not be treated with various other chemicals or processes (like some photographs), as the buffered surface may have long-term negative consequences. For example, if a material is meant to have a slightly acidic composition, it should not be stored with buffered tissue as the neutralization of the material may be detrimental over time.

Unbuffered Tissue is pH neutral, and is preferred when storing materials that by nature have a more acidic composition. These materials are predominately animal (protein) derived ones (like wool, silk, leather, fur...) but also include some color photographs. Using buffered tissue may neutralize these materials to their own detriment.

If you are still concerned about the objects you are storing & their composition,
we usually advise people to go with the Unbuffered Tissue as it is typically a safer bet.



So, in answer to the time old question:
"How can I store my mother's wedding gown & heirloom textiles
to preserve its condition for years to come?"

The answer lies in the material:
Natural plant derived fibers & some synthetics --> Buffered Tissue
Animal derived fibers & some color photographs --> Unbuffered Tissue


And of course always store these items with the appropriate tissue in Acid-Free boxes!


Download this instructional, from our website here.