Drying Milk Kefir Grains for Freezing.............

I am drying out a few milk kefir grains to freeze.  I want to be able to see if these live milk kefir grains can be frozen and then brought back to life again.  I washed these milk kefir grains off with water, then have been letting them at room temperature.  I am going to put the milk kefir grains in non-fat milk powder, when they are dried out and then put them into the freezer for a month or two before trying to use them again.
Norma

1 picture is of milk kefir left in refrigerator for 3 weeks.
2 picture of milk kefir grains to dry out
3 picture of milk kefir grains drying out
4 milk keifr poolish for Paul's flour mixed with KASL
5 milk kefir grains almost dried out