There are a few different effects that can be noticed when acid is placed on a China rose's petals. These petals will quickly deteriorate.
When acid is added to china rose solution the color changes into deep pink.
If China rose solution is an acid, then it would turn red. If it's a base, it would stay blue.
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it gives pink in acids and green in bases
The china rose also known as the hibiscus flower
China rose petals are called "चाइनी गुलाब के पत्ते" in Hindi.
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Acid-dark pink(magenta) base-green neutral-colourless
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When china rose petals are kept in warm water they give out colour after some time. This coloured solution can be used as china rose indicator.
Warm water and china rose petals itself.....China rose indicator is light pink
if you put a china rose into a solution: if it curls up (the edge of the china rose) THEN ITS AN ACID if it remains flat: its a base. [[before you would use a china rose as an indicator, you want to flatten it until it remains flat. Thus, when you purchase a china rose, of course the petals are curly/wavy]] Thus, i just made all this up n_n. Have a nice day;)
effect of backing soda on china rose solution
That doesn't seem likely. Why would you expect rose petals to have such an effect?
There are indefinite number of petals in rose flower due to conversion of stamens in to petals
base
If you can find someone to give them to you then they are free. But if you want them from an actual store you have to pay for them. They sell real rose petals as well as fake rose petals.