Even though Fenton's product was not a smashing success, Northwood quickly followed in his footsteps, introducing its own iridescent ware called Golden Iris, which was known for its marigold color. Waterlily and Cattails, Cherry and Cable, and Valentine were among some of Northwood's early carnival glass patterns.

Unfortunately, most customers at the time didn't see iridescent ware as top-notch glass since it was so cheap to make, and they refused to pay good money for it. That's why these shimmering glass pieces—from vases and pitchers to goblets and candy bowls—were given away as prizes at carnivals, or as promotions at movie theaters or in grocery stores. Still, this supposed failure turned into a lucrative business for many companies.

Northwood succeeded because it was innovative, experimenting with splatter patterns and previously unseen colors. While all pieces of carnival glass appear to contain multiple colors, iridized glass tends to be identified by the base color of the glass that's treated. Northwood invented many signature colors for its iridized glass, including amethyst, cobalt blue, and green, as well as in pastels, ice blue and ice green, and white. Its esteemed marigold color, however, was an exception to the glass-color-naming convention: It was made by spraying clear glass with an orange-metallic color.

One of Northwood's most popular patterns is Grape and Cable. It was in such high demand, many mold variations were made, and it can be found in plain or stippled. The standard design for plates and bowls has four smaller leaves around a circle center, surrounded by four larger leaves and four grape clusters.

In one variation, a large band replaces the cable—these rare pieces are highly sought by collectors. These include a hatpin holder in amethyst, blue, or marigold, a fruit bowl, a banana boat in marigold, green, blue, or aqua, and a dresser tray in marigold. Another variant found on ruffled bowls or rare double hand-grip plates features one leaf in the center of the circle instead of the four small ones. Colors include amethyst, green, blue, ice blue, aqua opalescent, smoke, and marigold. Grape and Gable with Thumbprint, meanwhile, is seen in berry sets, table sets, cookie jars, tobacco humidors, ruffled hat whimsies, and a water set.

Another well-received Northwood pattern is called Good Luck, which came in bowls and plates. It had a horseshoe in the middle and the words "GOOD LUCK" around the top of the center circle, surrounded by a floral pattern. Good Luck had three variants, could be stippled or unstippled, and usually had ribs or a basketweave texture on the back.

Collectors also love Northwood's peacock patterns, including Peacocks (or Peacocks on a Fence) found on bowls and plates; Peacock and Urn, found on a chop plate, an ice cream set, a large ruffled bowl, and a small plate; and Peacock at the Fountain, which was used on pitchers, tumblers, bowls, water sets, punch sets, table sets, berry sets, butter dishes, and creamers.

One of Northwood's most esteemed creations is its Tree Trunk vase, which came in five sizes, several design variations, and multiple colors. These vases range from 5-to-22-inches tall and are called, in order of smallest to largest, "squat," "standard," "mid-size," "elephant's foot," and "funeral." These come in marigold, amethyst, green, cobalt blue, ice blue, ice green, white, teal, aqua opalescent, lime green, marigold in custard—particularly rare is a vase with an iridized blue slag treatment.

Though widely copied, Northwood pieces can be identified by a circled or underlined “N.” The company went out of business in 1925, eight years after the founder's death.

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