Iridescent Gold

What chemical is purple in the bottle and gold upon touching air?

I remember using it in Grade 12 biology, and I think we were staining cells with it. It was incredibly vivid purple or indigo in the bottle and when it hit skin (as my lab partner found out, whoops) but when just a little was spilled on the counter top or dribbled down the side of the bottle it turned a remarkable iridescent gold colour.

I remember the teacher referred to it as "(something) Violet" or "(something) Purple". Any ideas?

Cell staining is usually done with crystal violet, also called gentian violet.

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Hand blown Iridescent Gold And White Oil Lamp Vase
Hand blown Iridescent Gold And White Oil Lamp Vase
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Orange Gold Iridescent Carnival Glass Plate Wheat Leaves Pretty Colors 825
Orange Gold Iridescent Carnival Glass Plate Wheat Leaves Pretty Colors 825
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SUPERB LOETZ GOLD IRIDESCENT  SILVER OVERLAY VASE CIRCA 1900
SUPERB LOETZ GOLD IRIDESCENT SILVER OVERLAY VASE CIRCA 1900
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Jeannette Carnival Glass Iris Iridescent 2 Double Light Candlesticks Flora Gold
Jeannette Carnival Glass Iris Iridescent 2 Double Light Candlesticks Flora Gold
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Flower Etched Glass Iridescent Cranberry Gold Highlights Pedestal Candy Dish
Flower Etched Glass Iridescent Cranberry Gold Highlights Pedestal Candy Dish
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Gold Iridescent Star Pattern Carnival Glass Bowl 9 Inches CA
Gold Iridescent Star Pattern Carnival Glass Bowl 9 Inches CA
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Fenton Gold Iridescent Carnival Opalescent Spiral Optic Basket Bill Fenton Sign
Fenton Gold Iridescent Carnival Opalescent Spiral Optic Basket Bill Fenton Sign
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New in Box SET 6 Elegant CORDIAL GLASSES I PREZIOSI ITALY IRIDESCENT Gold
New in Box SET 6 Elegant CORDIAL GLASSES I PREZIOSI ITALY IRIDESCENT Gold
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vintage blue  gold iridescent glass sandwich plate 1930s 1940s
vintage blue gold iridescent glass sandwich plate 1930s 1940s
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Fenton Bird Figurine Iridescent Gold Glass Hand Painted  Signed by Artist
Fenton Bird Figurine Iridescent Gold Glass Hand Painted Signed by Artist
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Iridescent Gold Carnival Glass 11 Egg Relish 1213 Vintage Indiana Glass
Iridescent Gold Carnival Glass 11 Egg Relish 1213 Vintage Indiana Glass
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Beautiful Iridescent Vaseline Glass Footed Bowl With Gold Flowers
Beautiful Iridescent Vaseline Glass Footed Bowl With Gold Flowers
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Dunbar Flori gold Iridescent Aramis Ring Tumbler
Dunbar Flori gold Iridescent Aramis Ring Tumbler
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Iridescent Gold Glass Tortoise Turtle Nuggets New Qty 2
Iridescent Gold Glass Tortoise Turtle Nuggets New Qty 2
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Kurt McVay Dichroic Art Glass 8 Dish Iridescent Fused Gold Blue Purple Nice
Kurt McVay Dichroic Art Glass 8 Dish Iridescent Fused Gold Blue Purple Nice
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Vtg Pressed CARNIVAL GLASS CORNUCOPIA VASE iridescent marigold gold honey
Vtg Pressed CARNIVAL GLASS CORNUCOPIA VASE iridescent marigold gold honey
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VINTAGE CARNIVAL GLASS GOLD IRIDESCENT CREAMER AND COASTER Beautiful Color
VINTAGE CARNIVAL GLASS GOLD IRIDESCENT CREAMER AND COASTER Beautiful Color
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NEW IN BOX BACCARAT CRYSTAL 2013 IRIDESCENT GOLD SNOWFLAKE CHRISTMAS ORNAMENT
NEW IN BOX BACCARAT CRYSTAL 2013 IRIDESCENT GOLD SNOWFLAKE CHRISTMAS ORNAMENT
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IRIDESCENT Gold Carnival Glass Candy Nut Dish 6 Scalloped Edge
IRIDESCENT Gold Carnival Glass Candy Nut Dish 6 Scalloped Edge
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BAROVIER TOSO VENETIAN IRIDESCENT GOLD SCULPTURE BOWL DISH MURANO ITALY ITALIAN
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ALF BARBINI IRIDESCENT GOLD APPLE FRUIT SCULPTURE BOWL DISH MURANO ITALY ITALIAN
ALF BARBINI IRIDESCENT GOLD APPLE FRUIT SCULPTURE BOWL DISH MURANO ITALY ITALIAN
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AMBER IRIDESCENT BUBBLE GOLD ART GLASS SCULPTURE BOWL DISH MURANO ITALY ITALIAN
AMBER IRIDESCENT BUBBLE GOLD ART GLASS SCULPTURE BOWL DISH MURANO ITALY ITALIAN
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AMBER IRIDESCENT GOLD ART GLASS SCULPTURE BOWL DISH MURANO ITALY ITALIAN LABEL
AMBER IRIDESCENT GOLD ART GLASS SCULPTURE BOWL DISH MURANO ITALY ITALIAN LABEL
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VENETIAN IRIDESCENT GOLD CASED GLASS SCULPTURE BOWL DISH MURANO ITALY ITALIAN LB
VENETIAN IRIDESCENT GOLD CASED GLASS SCULPTURE BOWL DISH MURANO ITALY ITALIAN LB
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Indiana Glass Co Crimped Hostess Plate Iridescent Gold Carnival Glass 1263 wBox
Indiana Glass Co Crimped Hostess Plate Iridescent Gold Carnival Glass 1263 wBox
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Akcam Handmade Art Glass Iridescent Gold Flower Candy Dish Bowl
Akcam Handmade Art Glass Iridescent Gold Flower Candy Dish Bowl
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Rueven Nouveau Art Glass Satin Finish Iridescent Purple Green Gold Vase
Rueven Nouveau Art Glass Satin Finish Iridescent Purple Green Gold Vase
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STEUBEN LARGE ART GLASS CENTER PIECE BOWL GOLD IRIDESCENT RARE SIZE 12 x 425
STEUBEN LARGE ART GLASS CENTER PIECE BOWL GOLD IRIDESCENT RARE SIZE 12 x 425
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Fenton Carnival Glass Green Gold Iridescent Grape  Cable Pattern Basket weave
Fenton Carnival Glass Green Gold Iridescent Grape Cable Pattern Basket weave
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5 VINTAGE JEANETTE PANEL OPTIC IRIDESCENT MARIGOLD 5 TUMBLERS Glass Gold Amber
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Vintage FENTON CARNIVAL GLASS AMBER Gold IRIDESCENT RUFFLED OPEN EDGE BASKET
Vintage FENTON CARNIVAL GLASS AMBER Gold IRIDESCENT RUFFLED OPEN EDGE BASKET
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VINTAGE Carnival Glass FOOTED BOWL Iridescent Gold Amber Harvest Grape
VINTAGE Carnival Glass FOOTED BOWL Iridescent Gold Amber Harvest Grape
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Wonderful Vintage Donald Carlson Iridescent Glass Vase 1974 Gold Yellow Colors
Wonderful Vintage Donald Carlson Iridescent Glass Vase 1974 Gold Yellow Colors
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Beautiful Robert Eickholt Glass Abstract Iridescent Vase Gold Foil Design
Beautiful Robert Eickholt Glass Abstract Iridescent Vase Gold Foil Design
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Antique Iridescent Set of Bowls Plates Wine Goblets Glasses Gold Stemware Lovely
Antique Iridescent Set of Bowls Plates Wine Goblets Glasses Gold Stemware Lovely
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Carnival glass iridescent gold bowl leaves  blackberries pattern
Carnival glass iridescent gold bowl leaves blackberries pattern
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Indiana Glass Carnival Glass Punch Bowl Iridescent Marigold Gold 12 Cups
Indiana Glass Carnival Glass Punch Bowl Iridescent Marigold Gold 12 Cups
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Signed D Anderson Hand painted Fenton Art Glass Iridescent Egg W Gold Pedestal
Signed D Anderson Hand painted Fenton Art Glass Iridescent Egg W Gold Pedestal
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Vintage Carnival Glass Iridescent Gold Large 9 1 2 Serving Bowl Made in USA
Vintage Carnival Glass Iridescent Gold Large 9 1 2 Serving Bowl Made in USA
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Vintage Iridescent Blue Glass Pedestal Compote Dish W Gold Trim in Box
Vintage Iridescent Blue Glass Pedestal Compote Dish W Gold Trim in Box
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