this rec ipe its geat for making paper mache proyects or just for using it as a unexpensive and docile glue

materials;
2 or 3 spoons of flour
water

and a little of ALUM stone about a tea spoon measure.

this little secret ingredient will keep the mixture useful for about a week and the proyects wont get moldy.

i have been searching the traslation of "piedra alumbre" on the internet and i got

AlNH4(SO4)*12H2O

or

Potassium Alum DSI (SO4) 2 • 12H2O.

Potassium alum has been a sought after natural mineral salt for thousands of years due to its abilities to effectively contribute to water purification, pickling, tanning, medical procedures and in cosmetics as an aftershave or deodorant

available at drougstores o pharmacies

Step 1: 1.- Use a Tin Cup

add 2 or 3 spoons of flour in the tin can on a little amount of cold water and stir

Step 2: 2.- Add Hot Water

fill the tin can with hot water and stir

Step 3: 3.- Stir Over Low Heat

Stir the mix over the heat and add about a tea spoon measure of the alum stone.
keep stirring

Step 4: 4,. Thats All!

MIx until the formula its docile and traslucent

you can use it for the paper mache mixture, as a docile glue (for paper) or dye it and paint, it wil keep the translucent effect!