Q: How can I determine if an object is a reproduction or has been repaired? -- Andy

A: Great question Andy, unfortunately some people will try to sell reproductions as the authentic item.

A portable ultraviolet light is an inexpensive tool to help your investigation.

We know that ultraviolet light is a valuable tool for crime investigators, but it can also be a great tool for collectors.

Because ultraviolet rays react differently to different materials, you can quickly determine the age and condition of certain items.

1. Paper items: Sometimes you can detect forged or reproduced historic documents by placing them under black light. White paper is treated with fluorescent compounds to enhance brightness. Generally white paper, pre-1950, will not fluoresce. Most paper made after this time will react to the UV rays. You can use this technique when questioning the age of post cards, signs, or books.

2. Textiles: Lake modern paper, many newer fibers will fluoresce under black light. Fibers such as rayon, or polyester will glow. Sometimes collectors will use this method to determine the age of textiles, but it can be unreliable. For example, if the item has been laundered in detergent, this will cause a vintage quilt to react to UV light. In this case try to obtain the history of the item, or consult other reference materials.

3. Cast Iron: UV light can be handy when examining old cast iron toys, such as mechanical banks. Antique items will rarely fluoresces. Modern paint pigment will react, and expose a repainted item or new toy.

4. Glass: Many serious glass collectors use UV light to detect unseen cracks and repairs.

* Green Depression or Vaseline Glass will react

* American clear glass made before the 30s will fluoresce yellow, reproductions will not.

* Lalique art glass -- pre-1945 will appear yellow, items made after 1945 will not react.

* Use only long wave UV lights, hand held models can be purchased for $20.

The opinions expressed are solely those of the writer. Sabrina Turner is a dealer in vintage items, including clothing and accessories. She can be reached at sabrinarn2000@yahoo.com.