En este Laboratorio en casa realizaremos una tinta invisible con materiales que podemos encontrar en casa. Para la realización de esta tinta vas a necesitar lo siguiente:
Materiales
- Jugo de limón
- Hoja de papel
- Un encendedor
- Una vela
- Un palito de dientes
Procedimiento
Toma un palito de dientes, humedece la punta con zumo de limón y escribe sobre un papel. Luego déjalo secar y el mensaje se volverá invisible. Para verlo de nuevo, acerca el papel a la llama de una vela y observa como podrás leer el mensaje.
OJO: Recuerda tener supervisión de algún adulto porque estarás trabajando con fuego.
Resultado
Los frutos cítricos como el limón y la naranja contienen un ácido orgánico llamado ácido cítrico que al exponerse al calor se deshidrate y se descomponga por efecto de la temperatura, mostrándose de color marrón o pardo, por lo cual se vuelve visible el mensaje escrito en el papel.
Dato Curioso
En la Primera Guerra Mundial, los agentes infiltrados utilizaban este procedimiento para enviar cartas a sus comandos centrales sin que el enemigo que revisaba la correspondencia se diera cuenta. Esto duró muy poco porque a medida que avanzó la guerra el bando enemigo se dio cuenta como descubrir los mensajes.
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