As a collector, it is important to fully understand the quality and condition of your objet d’art prior to making a purchase. Both quality and condition directly contribute to value, and a black light is a great tool to use on fine art, antiques, collectibles and other objects of curiosity. Overall, contemporary paints and repairs become evident under black light, and it is a fairly simple method to put into practice, requiring only a black light (either big or small) and a dark room. Note that the use of the black light should also be fortified with additional research, and in many cases, a professional should be consulted. Be careful not to over expose your fine art and collectibles to ultraviolet light.
Paintings:
A black light can be used to inspect paintings for touch-ups and repairs. Tiny cracks in oil paintings will also show under ultraviolet light, and illegible signatures can often be deciphered.
Glass:
The uranium oxide in collectible Depression and Vaseline glass will glow under a black light. American colorless pressed glass made before 1930 is said to fluoresce with a yellow tint, where as reproductions in most cases will not. It has been said by various professionals that American brilliant cut glass also casts a yellow hue under ultraviolet light (see image). Others say it glows in a pale violet or blue hue. Because of the difference in opinions, it is important to follow up with additional research to ensure authenticity.
Documents & Manuscripts:
Chemical bleaches and dyes used in modern documents and manuscripts will also glow under the black light.
Antique Toys:
Cast iron was used to make many early 20th century toys. In order to determine if the toy is a modern replica or not, use a black light to check and see if the paint glows. If it does, then the toy is a modern replica.
MIR Appraisal Services, Inc.
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