any droplet of water ruins them.
The "photo" paper to print photos is very expensive. The normal paper provides regular results.
I used normal 75g A4 paper for this try. My printer is a HP multifunction 1200 series.
Step 1: The recipe
-An iron whith temperature control
-a stearin or paraffin candle
-a casserole or pot
Step 2: Doing
--Connect it to the electric line.
--Put the iron over the casserole, with the hot plate up.
--Put the paper over the hot plate. The print can be up or down.
--Slide the candle over the surface. The paraffine must melt and impregnate the paper
Step 3: Reviewing the work
You can use kitchen towels, scrap paper, or so. I used printed paper. The clean face is touching the fotos.
Below I put another sheet of paper.
Then carefully slide the plate on the paper sandwich.
Excess paraffin was absorbed by the top and bottom papers.
Step 4: Ending
Now, the photos are almost water-proof!
Another way to preserve your photos is to use spray colorless varnish, in 3 or 4 layers. The problem is that the varnish is never really colorless, and the photos gets yellow.