Hi Amy,
This is directly copied from the site you cited:

Collections may also be dried outside in the sun (sunlight or ultraviolet 
light can cause some molds to become dormant). The outside humidity must 
be low. Be aware that the sun causes fading and other damage to paper-
based collections, however. Materials should be monitored closely and left 
outside no more than an hour or so.

So caution must be used with sunlight- but it has always worked for us.

Sincerely,
David Ryan
Registrar
Colorado Springs Pioneers Museum
www.cspm.org 

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