1kg bag ALUMINIUM SULPHATE 17% Iron Free Alum Al2(SO4)3

I used this as part of a flower pounding project. It is a white powder that you mix with water and soak material in. Once dried this acts as a mordant on the material for the flower dyes and preserves the colours. Easy to use and I didn’t find it affected my skin at all though I was more careful to keep away from my eyes.

Does what it was intended for, as a mordant. Worked perfectly.

It works for the purpose I bought it. Hydrangea has beautiful blue flowers

My son asked to order for their art biology project. In terms of chemistry effect it worked. My son asked me to order more.

good quality a plus+++++

I bought this to turn my potted pink Hydrangea blue, despite adding vinegar to help break down the product, the hydrangea is still pink. So a waste of money for me but maybe i did something wrong?

Snapped a point in my dart and this made it super easy to remove.

I think as long as you start to use this in September (early) it will keep your hydrangeas blue throughout their growing season. It’s a pain to make up each time but a teaspoon in a 2L bottle is usually enough to hydrate the plant and maintain its colour.