Separación de los pigmentos de una tinta
Materiales:
- Una tira de papel de filtro o poroso (se puede usar el papel del filtro de una cafetera o incluso recortar el extremo, sin tinta, de una hoja de periódico)
- Marcadores/rotuladores o bolígrafos de distintos colores
- Un vaso
- Alcohol
- Lápiz o cualquier material que te ayude a sujetar el papel poroso
Procedimiento
- Recorta una tira del papel poroso que tenga unos 4 cm de ancho y una altura un poco mayor a la del vaso.
- Enrolla un extremo en un lápiz (puedes fijarlo con cinta adhesiva) de tal manera que el otro extremo llegue al fondo del vaso.
- Pinta una mancha con un marcador negro en el extremo libre de la tira, a unos 2 cm del borde. Procura que sea intensa, pero que no ocupe mucho espacio.
- Vierte alcohol en el vaso hasta una altura de 1 cm, aproximadamente.
- Coloca la tira dentro del vaso de tal forma que el extremo quede inmerso en el alcohol, pero la mancha fuera de él.
- Para mejores resultados, puedes tapar el vaso para evitar que el alcohol se evapore.
- Observa lo que ocurre: a medida que el alcohol va ascendiendo a lo largo de la tira, arrastra consigo los diversos pigmentos que contiene la mancha de tinta. Como no todos son arrastrados con la misma velocidad, al cabo de un rato se ven franjas de colores.
Resultados.
Muy práctico sencillo y de bajo costo.
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