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US 10,591,419 B2Granted
pH colour indicator for use with agricultural compounds
AssigneeNutriAg Ltd.
InventorsMartin David Bloomberg, Mark Stewart Houston-McMillan
Life of this patent
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Abstract
This invention discloses a new class of pH indicators suitable for use in agricultural compounds. The class comprises naturally occurring substances which are extracts from grape skins, cabbage and lecithin. Safety concerns are now causing regulatory bodies to prohibit use of chemical pH indicators in compounds which are used for crops and animals. The naturally occurring compounds of this invention satisfy these concerns of the regulators and function as well as chemical indicators of the prior art.
Claims5
A liquid concentrate comprising a mixture of:
- an acidic pH modifying agent;
- and
- a naturally occurring pH indicator for coloring water, said naturally occurring pH indicator consisting of an extract of cabbage,
- wherein the proportions of the pH modifying agent and the pH indicator in the concentrate are such that when the concentrate is diluted with water and the pH of the water is modified by the pH modifying agent, the pH indicator indicates visually by a color change when the pH of the water is in the range of from about 4 to about 6.
1 more element
Dependencies are inferred from the claim text.