After a day of searching this is the best answer i can come up with. WCA is water soluble calcium. I wish there was a tested method. Everything i find relies on blind faith in the author. A radioactive isotope bound to the calcium would allow you to tell where the calcium is going and where it is stored.
How to use WCA
This WCA is effective in converting plants life cycle from vegetative to reproductive growth. Natural Farmers spray WCA on the leaves after the fruits have become large. They prevent over growth and make a sweet hard fruit.
WCA strengthens the flower bud, you will get good fruits this year and big yield next year. Use with water soluble calcium phosphate,false acacia FPJ, OHN, sea water you will have better aroma fruits.
As crop enter their later stages of the life cycle they need calcium,salt and variety of minerals. Calcium and salt are very important for their health.
To disregard this aspect and focus on only NPK is wrong. And side-effects are seen everywhere.
Calcium moves carbohydrate from body(leaf and branch) to the storage organs(fruit).It is effective when crops have overgrown,leaves have bad color or no shine,floral differentiation is weak,flower blossoms just fall,fruits don’t ripe,or the fruits are not sweet.