henna (in Botany)

Описание: morethancobuildlessthanwikipedia

Recommended for English learners with TOEFL iBT:72–120, IELTS: 5.5–9.0, Cambridge English: 160-230, TOEIC: 1560–1990, EIKEN: Pre1-1

#TOEFL iBT #IELTS #Cambridge English #TOEIC #EIKEN

This video is designed for English learners who hope to expand their advanced English vocabulary with texts from academic fields.
#advancedEnglish #vocabulary #academicEnglish #practicalEnglish #Englishskill

Assisted by Perplexity

Video Title: #henna



subtitles

henna
Natural Pigments
in Traditional and Modern Science
Henna is one of the oldest
botanical dyes known to humans
Researchers study henna to understand
how its natural pigment, lawsone,
binds to proteins in skin and hair
This property
makes henna crucial
in both
cosmetic chemistry
and botanical taxonomy
In one example,
scientists test henna leaves
to study
how drought conditions affect
pigment concentration
They collect samples
from different climates
and measure color intensity
Their results show
that temperature and soil quality
directly change the dye strength
This helps farmers
grow the most vivid henna plants
for export
In another experiment,
chemists extract henna pigment
to create eco-friendly textile dyes
They compare henna-treated cotton
with synthetic dye alternatives
The fabric dyed with henna
not only shows warm orange tones
but also resists bacteria naturally
Such findings
make henna an ideal subject
for sustainable design research
Therefore,
this example illustrates the link
between biology
and environmental chemistry
In summary,
henna shows
how plant pigments connect
ancient practices with modern science
So henna means
"a tropical shrub
whose leaves yield a reddish dye
used for coloring skin and hair"
This definition focuses on
both the plant itself
and the dye it produces
Synonyms include
mignonette tree
Egyptian privet
and lawsonia inermis
Get subtitles from the description