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From pulling petals off daisies to counting letters in people's names, people have used many dubious methods to work out whether they have a future with someone they fancy.

But now a new home test claims to tell the difference between a fleeting fling and a relationship that could mean a couple live happily ever after, by using a combination of genetic and psychological tests.

The kit offers an 'affordable way to test chemistry and compatibility long before a life-changing commitment is made, between a couple,' according to Ontario, Canada-based firm, Instant Chemistry, which devised the tests.

Happily ever after? Instant Chemistry, a new home test, (pictured) claims to tell the difference between a fleeting fling and an enduring relationship using a combination of genetic and psychological tests

The company claims to have come up with the first ever at-home compatibility test that is backed by scientific and psychological research – but it comes at a cost of CAD$149 (US$164; £81).

The kit comprises three tests including one that compares the genetic strands of two people to report on their long-term compatibility and chemistry.

'Through intensive research scientists have found that long-term relationship satisfaction stems from two constants – your DNA and core personality – and how those match up with your partners,' said Dr Sara Seabrooke, chief science officer of Instant Chemistry.

'The science behind Instant Chemistry's kits is based on this research. By combining biological and psychological tests, we can determine how compatible you are with your partner and provide ways to offset incompatibilities, for example changing a small habit.'

The Couples Kit contains two biological tests, one based on relationship satisfaction and the other on long-term chemistry.

The Relationship Satisfaction test, which is backed by research from University of California, Berkeley, determines how two people's brains process serotonin, revealing differences in their emotional reactions to varying situations.

Serotonin is associated with relationship success and marital success.

The second biological test, called Long-Term Chemistry, is based on 20 years of research and looks at how well partners' genetic makeup complements each other.

The kit comprises three tests including one that compares the genetic strands of two people to report on their long-term compatibility and chemistry. Artwork of DNA is pictured

This information can be used to look at key components of DNA, such as how partners react to scent - a proven way to determine how physically attracted partners will be years from now, the firm explained.

Finally, a couple can do an online psychological compatibility test to identify each other's personality traits and what they mean in terms of stability and happiness in a relationship.

'Combined with the biological tests, Instant Chemistry is able to determine the underlying compatibility of partners and recognise what will help a relationship to further grow,' the company claims.

If compatibility is lacking, Instant Chemistry provides ways to detect conflict before it arises and advice on ways to improve a relationship.

Wedding bells? 'Combined with the biological tests, Instant Chemistry is able to determine the underlying compatibility of partners, and recognise what will help a relationship to further grow,' the company claims. It is billed as the modern way to see if a relationship might have marriage potential (illustrated)